My iMac has firewire. So can I install tiger?

are there downsides to using a cardboard box for a case? because i have way too many of those and i think it'd be kinda cool to have a carboard computer...

and I don't really mind the 128gb limit for now, I don't even have a purpose for this yet since i have much more powerful computers i'm using as servers, maybe i'll just let it manage backups for me or something...I guess i would need a larger drive for that. Meh,
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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