yes thats the idea
finally some encouraging responses, thanks, looks like i will be limited to 2.5 inch hdd i believe a 3.5 hdd will be too tall (dammitt) although the other 2 dimensions should be ok. . . . . .some of you may be wondering why worry or bother? . . . . . well i happen to like this machine, it runs 10.4 smoothly and faster than 10.2, best available connection at home is 56k dial up, son's in college so airport card will be installed in next few weeks (if anyone has an xtra one around, working of course, they'd part with. . . . let me know your terms & conditions) son lives at home and we share this unit seems to me an expansion bay hdd would be perfect solution . . . . 2 computers in 1 . . . .an idea that appeals to each of us and yes i'm keeping my eye on ebay looking for IT and could buy the enclosure for $70 but i'm just allergic to doing that except as a last resort . . . . . .since you've been so patient listening to my rant which processor upgrade would you suggest? 500 or 550 G4 or 900 G3 or if can find one the 1ghz G3?