'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...
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MacBook Pro Intel Core Duo 2.0ghz, 1gb ram
Dell 228WPF 22" monitor
Mybook Premium 320gb
iPod Nano 4gb (red)
Wacom Intuos3 6x11