That and now that I think about it, the ol' Armatron sitting in my parents garage attic would defiantly be worth taking apart.
Whatever you do - don't do this! The Armatron has become a "collector's item" robot; you take it apart (and can't get it back together again), you might be looking at wasting what is sure to become worth more than $100.00 in a few years. Right now, the price is fluctuating, but most seem to be hovering around $50.00, depending on the condition (if it has all its parts, stickers, box, styrofoam).
Also - if that Armatron has everything (and I mean everything), and it is the Tomy branded version - let's just say you don't find those around any more. The Radio Shack version is ubiquitous, and recent re-make releases (yes, they did remake it and release it - but it was hideous looking) haven't harmed the value much, since the re-releases look nothing like the original Armatron (just body styling, more than anything).
So - if it is in any good shape at all - don't take it apart!
With that said - if you get your hands on one that is in "bad shape", your best bet (if you don't want to sell it for whatever you can get, or part it out to rebuilders/repairers) is to re-work it so that you can interface it with the Arduino and control it via your computer (or standalone with the Arduino).
Back in the 1980s, there were an absolute ton of articles on how to interface your Armatron with a computer. I don't know if I have them all, but I do know I have a good amount of them. If you are interested in taking this route (which is a good way to preserve an "abused" Armatron and give it new life) - check out some articles on my website about it, starting here:
Follow the reference articles at the bottom to see other archives (I had built the archive, and then I started to find other articles and other Armatron stuff - I thought I had it all, but I didn't!).