Archin - is a scripts for install ArchLinux
Write archin to additional media. Begin installation of ArchLinux. Make partitions where ArchLinux will be installed. Insert media with copy of archin and mount it. Copy archin directory to the home directory. Change variables in begin of ~/archin/archin.sh and ~/archin/newroot.sh files for your purposes. Run ~/archin/archin.sh, it install base system and kernel to target partition and change root to new filesystem. Reboot whithout installation media. Login as root. Run /newroot.sh on the new file system. Reboot, enable internet commection with wifi-menu or dhcpcd or... Now you can install X's by your hands)))