Hiya Capnsim,
Decent score there.
Here's a good overview:
http://www.bunkerofdoom.com/rt68/index.html
I can help on some of them: The PP-112 (check the data plate on the front of the unit) is the 24v power supply for the RT-68, RT-67, and RT-66 radios. It looks as though you have about six of those. The RT-68, et al, is a short range FM vehicle set. The three radios operate on three different freq bands. The RT-68 operates from 38 to 54 MHz (infantry, if I recall correctly). You can operate this radio with the lowest grade of ham license (technician), though they take up a lot of bandwith. Operators using the new narrow-band equipment may have difficulty understanding your transmissions due to the side bands being cut off. You will be able to communicate with all your buddies that are sporting the PRC-77, though.
I can't tell which of the RTs you have, but you have four of them in the second stack. You might luck out and have a bunch of -68s in there. There ought to be enough to get one set working.
Probably the most expensive will be the required mount, the MT-299. Bizal at Midwest had them last year. Other than John, it's pretty hit-and-miss in finding them.
I can send you pics of my set-up if you email me. It isn't working at the moment, but soon will be now that it's time to be working indoors.
Parts (especially tubes) are pretty spendy, but you have a good source of spares on-hand there.
Here's a good parts source for when you run out of sets to canabilize:
http://www.fairradio.com/
They also have a lot of the accessories you'll need like speakers, headsets, antennas, etc.
My M-38A1 came with an incomplete RT-68 set, and I wasn't going to bother with it, but a couple of buddies are big into ham radio and got me interested. The test is VERY easy. I'm not much a jaw-jacker, but playing with the vintage set is fun, especially when mounted in the vehicle. It's all about atmosphere.
Have fun...
Dave
Home
Lot's a great stuff I hadn't found yet. 
