'headless' meaning what, removing the crt? I think its running osx 10.2, what are the volume size limitations of 10.2? (Would I be able to put in a...say...250gb hard drive to replace the 30gb it has now without upgrading the OS?)

edit: actually, would i be able to have both the 250 and the 30 plus a disk drive? because i can't replace the 30gb since i dont have the restore discs anymore, so i need to keep the os on the drive or im screwed...
MacBook Pro Intel Core Duo 2.0ghz, 1gb ram
Dell 228WPF 22" monitor
Mybook Premium 320gb
iPod Nano 4gb (red)
Wacom Intuos3 6x11