Man if that wasn't in the US I'd be warming up my dremel as we speak }
No, in truth if I was to casemod it, I'd try to keep the case completely stock, and the new components completely stealth. That way it could always be returned to virgin Lisa status if I got bored with it.
ie not like this: UR DOIN IT RONG
Them's lynchin' words round these parts .... /edit/ but I suppose you could run GlobalView or GNUstep or LisaEM on it