One of mine (the large 123 console) is pretty nasty too, looks like it sat in a basement most of its life. Bottom plywood board is going to need replacement, it's missing the back (have a template to make one), and the finish is shot. The table model set isn't as bad, but will still need going through to be up to snuff.
Speaking of cabinets, I took the Silvertone to a local place to have it gone through. Place looks like it will be able to take care of me, and I gave them the lowdown on how to deal with bad photofinish. They are going to install new ribbon mahogany for me, replace the broken speaker board, and put new grill cloth on it from AES. AES had a cloth that was very close to the original, I got lucky. Price was a little more than I wanted to pay, but I'd really rather not do it again myself because it was such a pain.
Here's the place I took it to:
http://www.schoenbauer.com/