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diff --git a/build.sh b/build.sh
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+#!/bin/bash
+# build.sh - Build the custom Arch ZFS installation ISO
+# Must be run as root
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROFILE_DIR="$SCRIPT_DIR/profile"
+WORK_DIR="$SCRIPT_DIR/work"
+OUT_DIR="$SCRIPT_DIR/out"
+CUSTOM_DIR="$SCRIPT_DIR/custom"
+ZFS_PKG_DIR="$SCRIPT_DIR/zfs-packages"
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+info() { echo -e "${GREEN}[INFO]${NC} $1"; }
+warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
+error() { echo -e "${RED}[ERROR]${NC} $1"; exit 1; }
+
+# Check root
+[[ $EUID -ne 0 ]] && error "This script must be run as root"
+
+# Check dependencies
+command -v mkarchiso >/dev/null 2>&1 || {
+    info "Installing archiso..."
+    pacman -Sy --noconfirm archiso
+}
+
+# Get current kernel version
+KERNEL_VER=$(pacman -Si linux | grep Version | awk '{print $3}')
+info "Current Arch kernel version: $KERNEL_VER"
+
+# Download ZFS packages from GitHub releases
+info "Downloading ZFS packages for kernel $KERNEL_VER..."
+mkdir -p "$ZFS_PKG_DIR"
+
+# Find matching ZFS packages from experimental release
+ZFS_LINUX_URL=$(curl -s https://api.github.com/repos/archzfs/archzfs/releases/tags/experimental | \
+    jq -r ".assets[] | select(.name | contains(\"zfs-linux-\") and contains(\"${KERNEL_VER}\") and (contains(\"-headers\") | not) and contains(\".pkg.tar.zst\") and (contains(\".sig\") | not)) | .browser_download_url" | head -1)
+
+ZFS_UTILS_URL=$(curl -s https://api.github.com/repos/archzfs/archzfs/releases/tags/experimental | \
+    jq -r '.assets[] | select(.name | contains("zfs-utils-") and contains(".pkg.tar.zst") and (contains(".sig") | not) and (contains("debug") | not)) | .browser_download_url' | head -1)
+
+if [[ -z "$ZFS_LINUX_URL" ]]; then
+    warn "No ZFS package found for kernel $KERNEL_VER in experimental"
+    warn "Checking other releases..."
+
+    # Try to find any recent zfs-linux package
+    ZFS_LINUX_URL=$(curl -s https://api.github.com/repos/archzfs/archzfs/releases | \
+        jq -r ".[].assets[] | select(.name | contains(\"zfs-linux-\") and contains(\"6.18\") and (contains(\"-headers\") | not) and contains(\".pkg.tar.zst\") and (contains(\".sig\") | not)) | .browser_download_url" | head -1)
+fi
+
+if [[ -z "$ZFS_LINUX_URL" || -z "$ZFS_UTILS_URL" ]]; then
+    error "Could not find matching ZFS packages. The archzfs repo may not have packages for kernel $KERNEL_VER yet."
+fi
+
+info "Downloading: $(basename "$ZFS_LINUX_URL")"
+wget -q -N -P "$ZFS_PKG_DIR" "$ZFS_LINUX_URL" || error "Failed to download zfs-linux"
+
+info "Downloading: $(basename "$ZFS_UTILS_URL")"
+wget -q -N -P "$ZFS_PKG_DIR" "$ZFS_UTILS_URL" || error "Failed to download zfs-utils"
+
+# Clean previous builds
+if [[ -d "$WORK_DIR" ]]; then
+    warn "Removing previous work directory..."
+    rm -rf "$WORK_DIR"
+fi
+
+# Always start fresh from releng profile
+info "Copying base releng profile..."
+rm -rf "$PROFILE_DIR"
+cp -r /usr/share/archiso/configs/releng "$PROFILE_DIR"
+
+# Add our custom packages (NOT zfs - we'll install that separately)
+info "Adding custom packages..."
+cat >> "$PROFILE_DIR/packages.x86_64" << 'EOF'
+
+# Additional networking
+wget
+
+# Development tools for Claude Code
+nodejs
+npm
+jq
+
+# Additional utilities
+zsh
+htop
+ripgrep
+eza
+fd
+fzf
+
+# For installation scripts
+dialog
+EOF
+
+# Update profiledef.sh with our ISO name
+info "Updating ISO metadata..."
+sed -i 's/^iso_name=.*/iso_name="archzfs-claude"/' "$PROFILE_DIR/profiledef.sh"
+
+# Create airootfs directories
+mkdir -p "$PROFILE_DIR/airootfs/usr/local/bin"
+mkdir -p "$PROFILE_DIR/airootfs/code"
+mkdir -p "$PROFILE_DIR/airootfs/var/cache/zfs-packages"
+
+# Copy ZFS packages to airootfs for installation during boot
+info "Copying ZFS packages to ISO..."
+cp "$ZFS_PKG_DIR"/*.pkg.tar.zst "$PROFILE_DIR/airootfs/var/cache/zfs-packages/"
+
+# Copy our custom scripts
+info "Copying custom scripts..."
+cp "$CUSTOM_DIR/install-archzfs" "$PROFILE_DIR/airootfs/usr/local/bin/"
+cp "$CUSTOM_DIR/install-claude" "$PROFILE_DIR/airootfs/usr/local/bin/"
+cp "$CUSTOM_DIR/archsetup-zfs" "$PROFILE_DIR/airootfs/usr/local/bin/"
+
+# Create ZFS setup script that runs on boot
+cat > "$PROFILE_DIR/airootfs/usr/local/bin/zfs-setup" << 'ZFSSETUP'
+#!/bin/bash
+# Install ZFS packages and load module
+# Run this first after booting the ISO
+
+set -e
+
+echo "Installing ZFS packages..."
+pacman -U --noconfirm /var/cache/zfs-packages/*.pkg.tar.zst
+
+echo "Loading ZFS module..."
+modprobe zfs
+
+echo ""
+echo "ZFS is ready! You can now run:"
+echo "  install-archzfs"
+echo ""
+ZFSSETUP
+
+# Set permissions in profiledef.sh
+info "Setting file permissions..."
+if grep -q "file_permissions=" "$PROFILE_DIR/profiledef.sh"; then
+    sed -i '/^file_permissions=(/,/)/ {
+        /)/ i\  ["/usr/local/bin/install-archzfs"]="0:0:755"
+    }' "$PROFILE_DIR/profiledef.sh"
+    sed -i '/^file_permissions=(/,/)/ {
+        /)/ i\  ["/usr/local/bin/install-claude"]="0:0:755"
+    }' "$PROFILE_DIR/profiledef.sh"
+    sed -i '/^file_permissions=(/,/)/ {
+        /)/ i\  ["/usr/local/bin/archsetup-zfs"]="0:0:755"
+    }' "$PROFILE_DIR/profiledef.sh"
+    sed -i '/^file_permissions=(/,/)/ {
+        /)/ i\  ["/usr/local/bin/zfs-setup"]="0:0:755"
+    }' "$PROFILE_DIR/profiledef.sh"
+fi
+
+# Copy archsetup into airootfs
+if [[ -d /home/cjennings/code/archsetup ]]; then
+    info "Copying archsetup into ISO..."
+    cp -r /home/cjennings/code/archsetup "$PROFILE_DIR/airootfs/code/"
+    rm -rf "$PROFILE_DIR/airootfs/code/archsetup/.git"
+    rm -rf "$PROFILE_DIR/airootfs/code/archsetup/.claude"
+fi
+
+# Ensure scripts are executable in the profile
+chmod +x "$PROFILE_DIR/airootfs/usr/local/bin/"*
+
+# Build the ISO
+info "Building ISO (this will take a while)..."
+mkarchiso -v -w "$WORK_DIR" -o "$OUT_DIR" "$PROFILE_DIR"
+
+# Report results
+ISO_FILE=$(ls -t "$OUT_DIR"/*.iso 2>/dev/null | head -1)
+if [[ -f "$ISO_FILE" ]]; then
+    echo ""
+    info "Build complete!"
+    info "ISO location: $ISO_FILE"
+    info "ISO size: $(du -h "$ISO_FILE" | cut -f1)"
+    echo ""
+    info "To test: ./scripts/test-vm.sh"
+    echo ""
+    info "After booting, run:"
+    echo "  zfs-setup        # Install ZFS and load module"
+    echo "  install-archzfs  # Run the installer"
+else
+    error "Build failed - no ISO file found"
+fi