diff --git a/builder.config.example b/builder.config.example
new file mode 100644
index 0000000..6c61b7c
--- /dev/null
+++ b/builder.config.example
@@ -0,0 +1,4 @@
+#
+ISO_BASEDIR="/mnt/machines/iso"
+#
+DISK_BASEDIR="/mnt/machines/qemu-machines"
diff --git a/isobuilder.sh b/isobuilder.sh
index 87d6888..8f89c39 100644
--- a/isobuilder.sh
+++ b/isobuilder.sh
@@ -30,7 +30,7 @@ function detect_iso_arch {
 	local iso_file="${1}"
 	local fallback_arch="${2}"
 	case "${iso_file@L}" in
-	*-amd64-*|*-x64-*)
+	*-amd64-*|*-x64-*|*_x64_*)
 		echo "amd64" ;;
 	*-arm64-*|*-aarch64-*)
 		echo "arm64" ;;
diff --git a/win11-builder-generic.sh b/win11-builder-generic.sh
index c6f51a4..4d1b156 100755
--- a/win11-builder-generic.sh
+++ b/win11-builder-generic.sh
@@ -1,26 +1,30 @@
 #!/usr/bin/env /bin/bash
-declare -r TOP_BASEDIR="`pwd`"
+declare -r TOP_BASEDIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)"
+
+# read global builder config
+[[ -f "${TOP_BASEDIR}/builder.config" ]] && {
+	source "${TOP_BASEDIR}/builder.config" || exit $?
+}
 
 #
 # ISO images
 #
-declare -r ISO_BASEDIR="/mnt/machines/iso"
-
 # Windows installation ISO
 #declare -r INSTALL_ISO="${ISO_BASEDIR}/Win11_25H2_English_x64_v2.iso"
 #declare -r INSTALL_ISO="${ISO_BASEDIR}/nano11-25H2-English-Pro-2026-03-20.iso"
-declare -r INSTALL_ISO="${TOP_BASEDIR}/output/install-builder-amd64-20260601.iso"
+declare -r INSTALL_ISO="${ISO_BASEDIR}/nano11-base-25H2-Pro-Eng-amd64-20260526.iso"
+#declare -r INSTALL_ISO="${TOP_BASEDIR}/output/install-builder-amd64-20260601.iso"
 
 # Unattended installation add-on ISO
 #declare -r UNATTEND_ISO="${TOP_BASEDIR}/output/unattend.iso"
+declare -r UNATTEND_CONFIG="${TOP_BASEDIR}/configs/autounattend-builder-amd64-20260604.xml"
 
 declare -r VIRTIO_ISO="${ISO_BASEDIR}/virtio-win-0.1.285.iso"
 
 #
 # Disk images
 #
-declare -r DISK_BASEDIR="/mnt/machines/qemu-machines"
-#declare -r DISK_IMG="${DISK_BASEDIR}/win11-builder-amd64.qcow2"
+declare -r DISK_IMG="${DISK_BASEDIR}/win11-builder-amd64.qcow2"
 declare -r DISK_SIZE="32G"
 
 #
@@ -67,11 +71,21 @@ declare -r ARM64_EFI_CODE_SIZE="64M"
 declare -r COMMAND="${1:-build}"
 shift
 
+function has {
+	local val="${1}"
+	shift
+
+	for x in $@; do
+		[[ "${x}" == "${val}" ]] && return 0
+	done
+	return 1
+}
+
 function detect_iso_arch {
 	local iso_file="${1}"
 	local fallback_arch="${2}"
 	case "${iso_file@L}" in
-	*-amd64-*|*-x64-*)
+	*-amd64-*|*-x64-*|*_x64_*)
 		echo "amd64" ;;
 	*-arm64-*|*-aarch64-*)
 		echo "arm64" ;;
@@ -92,14 +106,14 @@ function detect_host_arch {
 # Detect host and guest architecture
 declare -r HOST_ARCH="$(detect_host_arch)"
 [[ -n "${HOST_ARCH}" ]] || {
-	echo "Failed to detect host arch" >&2;
-	exit 1;
+	echo "Failed to detect host arch" >&2
+	exit 1
 }
 
 declare -r GUEST_ARCH="$(detect_iso_arch "${INSTALL_ISO}" "${HOST_ARCH}")"
 [[ -n "${GUEST_ARCH}" ]] || {
-	echo "Failed to detect guest arch" >&2;
-	exit 1;
+	echo "Failed to detect guest arch" >&2
+	exit 1
 }
 
 # Setup locations
@@ -201,7 +215,6 @@ function fileext_from_qemu_image_type {
 	esac
 }
 
-
 function expand_size {
 	local value="${1}"
 	[[ "${value}" =~ ^[0-9]+$ ]] && {
@@ -256,7 +269,6 @@ function resize_image {
 	do_resize_image "${img_file}" "${img_type}" "${img_cur_size}" "${img_req_size}"
 }
 
-
 # Drivers for the WinPE early installation environment
 declare -r VIRTIO_WINPE_DRIVERS=(
 	"NetKVM"
@@ -265,12 +277,15 @@ declare -r VIRTIO_WINPE_DRIVERS=(
 	"viogpudo"
 )
 
-function has {
-	local val="${1}"; shift
-	for x in $@; do
-		[[ "${x}" == "${val}" ]] && return 0
-	done
-	return 1
+function guest_to_virtio_arch {
+	local arch="${1@L}"
+	case "${arch}" in
+	"arm64") echo "${arch@U}" ;;
+	"amd64") echo "${arch}" ;;
+	*)
+		echo "ERROR: Failed to determine virtio arch from '${arch}'" >&2
+		return 1 ;;
+	esac
 }
 
 #
@@ -294,16 +309,11 @@ function qemu_fill_unattend_fs {
 		< "${unattend_xml}" > "${destdir}/autounattend.xml" || return $?
 
 	#
-	local virtio_arch="${GUEST_ARCH@L}"
-	case "${GUEST_ARCH@L}" in
-	"arm64")
-		virtio_arch="${GUEST_ARCH@U}" ;;
-	"amd64")
-		virtio_arch="${GUEST_ARCH@L}" ;;
-	*)
-		echo "ERROR: " >&2
-		return 1 ;;
-	esac
+	# Additional resources
+	#   $OEM$\$$ -> C:\Windows
+	#   $OEM$\$1 -> C:\
+	#
+	mkdir -p "${destdir}/\$OEM\$/\$\$" "${destdir}/\$OEM\$/\$1" || return $?
 
 	# Copy virtio drivers
 	local virtio_iso="${3}"
@@ -312,6 +322,7 @@ function qemu_fill_unattend_fs {
 		return 1
 	}
 
+	local virtio_arch="$(guest_to_virtio_arch "${GUEST_ARCH}")" || return $?
 	local virtio_drivers_list="$(7z l -slt "${virtio_iso}" | sed -ne "/^Path = [^/]\+\/w11\/${virtio_arch}\$/{ s|^Path = \([^/]\+\)/.*|\1|; p }")"
 	[[ -n "${virtio_drivers_list}" ]] || {
 		echo "ERROR: No drivers found in VirtIO ISO image '${virtio_iso}'" >&2
@@ -339,31 +350,36 @@ function qemu_fill_unattend_fs {
 function qemu_generate_unattend_iso {
 	local destfile="${1}"
 
-	local destdir="${BASEDIR}/unattend.tmp"
+	local isogen_path=""
+	for x in "mkisofs" "genisoimage" "xorriso"; do
+		isogen_path="$(type -p "${x}" 2>/dev/null)" && break
+	done
+	[[ -n "${isogen_path}" ]] || {
+		echo "ERROR: Failed to find one of mkisofs | genisoimage | xorriso" >&2
+		return 1
+	}
+
+	local destdir="${BASEDIR}/unattend.${SRANDOM:-"tmp"}"
 	mkdir -p "${destdir}" || return $?
 
 	qemu_fill_unattend_fs "${destdir}" "${2}" "${3}" || return $?
 
-	if type -p "mkisofs" &>/dev/null; then
-		mkisofs \
-			-iso-level 3 -J -l -D -N -U -joliet-long -relaxed-filenames -rational-rock \
-			-V "win11-builder-unattend" -o "${destfile}" -quiet \
-			"${destdir}" || return $?
-	elif type -p "genisoimage" &>/dev/null; then
-		genisoimage \
-			-iso-level 3 -J -l -D -N -U -joliet-long -allow-limited-size -relaxed-filenames -rock \
-			-V "win11-builder-unattend" -o "${destfile}" -quiet \
-			"${destdir}" || return $?
-	elif type -p "xorriso" &>/dev/null; then
-		echo "ERROR: xorriso support is pending" >&2
-		return 1
-	else
-		echo "ERROR: Failed to find one of mkisofs | genisofs | xorriso" >&2
-		return 1
-	fi
+	local isogen_name="$(basename "${isogen_path}")"
+	case "${isogen_name}" in
+	"mkisofs")
+		${isogen_path} -iso-level 3 -J -l -D -N -U -joliet-long -relaxed-filenames -rational-rock \
+			-V "win11-builder-unattend" -o "${destfile}" -quiet "${destdir}" || return $? ;;
+	"genisoimage")
+		${isogen_path} -iso-level 3 -J -l -D -N -U -joliet-long -relaxed-filenames -rock -allow-limited-size \
+			-V "win11-builder-unattend" -o "${destfile}" -quiet "${destdir}" || return $? ;;
+	"xorriso")
+		echo "ERROR: ${isogen_name} support is pending" >&2
+		return 1 ;;
+	esac
 
 	# cleanup
-	find "${destdir}" -delete || return $?
+	find "${destdir}" -delete 2>/dev/null
+	return 0
 }
 
 function qemu_prepare_disk {