pci/agp not really an issue, linitx.com or even maplins sell flexible ribbon extensions for the ports so not really an issue ive actually got a low profile graphics card and as for sound gonna stick a SB card in there at some point.
i wanted to keep it a low as possible for a balance between airflow and bootspace.
oh and 3 IN THE BOOT!!!
buy stealth boxes for the sides of the boot and put a pc side one and a sub in the other... lol