With the motherboard in the case, there's no room for the original non-standard AT&T power supply, or for the XT-standard power supply, for that matter. So, I ripped out the worthless AT&T power supply, and I discovered a rather demented way of installing the XT power supply.
I mounted the power supply sideways, so that the On/Off switch sticks out the back, and the power cord comes in the back and connects inside. Without some sort of spacer, though, the power cord would rest directly on Frankenstein's RAM chips, so I made two stacks of three floppies, from a bunch of defunct Windows 3.1 floppies I had around.
So, now with a power supply, motherboard, and some cards in there, there's no room left for any floppy drives. Oh well. I didn't have any anyway. But I did have a hard drive, which I have laying upside down in the little remaining space in front of the power supply.
There's only one other major component *inside* Frankenstein... its speaker. I needed a speaker for Frankenstein, so I searched the graveyard high and low. After some searching, I found the perfect speaker for my beast--an old Kraco car stereo speaker. This was a fairly large speaker (a 4x6 speaker, I believe), with a sizeable magnet. The magnet was its best asset--I was able to stick the speaker to the top of Franky's interior, thus cramming the speaker in with everything else.