I've had a couple of powermac's (8600 and 9600) and ripped the internal ZIP, CD and HD from them. The harddrive (4GB) and CD-ROM drive are working happily together in the A2000. Due to lack of some parts I haven't been able to put the internal ZIP in it as well.
Note however that you must check twice with the adressing and terminating as I've came across bad termination on both Apples.