Finished product goes here.

An update:

I got a real AT power supply and stuck it in the base (not yet shown). The one I made was unable to provide enough current to have all the drives spinning at once.

The hard drives all spin up and LEDs work. I have to do some cable management and it'll be ready to... make a lot of noise!

Got it almost done:

https://youtu.be/lTxyFkq1r9k

What remains to be done:

-Align heads on the MFM drive enough so that it doesn't sound like a wet saw cutting ceramic tile (someone touched my display case)
-Label each drive's capacity, year of production, and interface type
-Clean up the wires a little more
-Attach a rubber foot for the base (it's uneven)

*edit if anyone wants to donate a Bigfoot that spins under its own power...

If you want to be really ambitious, try to make it look like Orac, the portable computer from Blake's 7*.

And here's Orac in action:

https://www.youtube.com/watch?v=NmjPk4hzRXM

(BTW, don't be fooled by the video's short length, each episode of B7 is around forty-eight minutes long, but despite having the program's opening sequence, that video is of the last few minutes of the last episode of the first season of the show).

* To my mind Blake's 7 is still the best television science-fiction program ever, despite it's slow start, it's almost non-existent budget, it's mostly terrible special effects, and some bad episodes. But at it's best it's superb, with great characters, dialogue and stories. How many other science fiction shows can you name that start with the hero being framed for child-abuse to discredit him with his followers, or where the main characters can and do die (and in Blake's 7, death is permanent, no pseudo-scientific bringing back a dead character, and there's no time travel in the program so the heroes can't be brought back via changing of the time-line)?

+1 pretty cool. would watch more of that.