DG 800/1200 questions

First on my bench will be a bunch (8 or so) of Data General 800/1200 machines and a few Nova 2's. I can think of several questions so far to get me started down the path: 1) A number of the 1200 machines have broken front panel toggle switches (the switch handle was broken off and lost). Some are spring return to center, some are just two position. Before I take the approach of robbing one of the machines for front panel switches, is there someplace that I can purchase exactly idential (both electrically and cosmetically) switches, or does some one have donor switches available for trade? I am a stickler for completely identical parts, especially for front panel switches :) I was hoping someone had been down this road before and knew the switch model #'s, etc. 2) I have quite a number (maybe around six or seven) of rackmount dual cassette tape units for these machines. I seem to recall that they use cassette tapes that are not identical to the standard common audio cassettes available today. Is anyone aware of where these special tapes can be purchased new? 3) With these machines I got a very large (several crates) library of cassette tapes as well as paper tapes, most appeared to be DG software rather than user data/backups. Are we pretty sure that most software for these machines has been archived somewhere, or should I send these tapes off to Al et. al. to have them read and saved for posterity before I put them in a questionable drive? As old as these tapes are, I wouldn't be suprised if one read was all they will allow. 4) Like #3 above, I have maybe 8 or 10 accounting storage boxes full of schematics & docs for all the circuit cards for the cpu's, interfaces, and peripherals mentioned above. I don't know what the current state of the DG archival project is. Is it likely that all these docs are already archived somewhere? Thanks in advance for any sage advice! Best, J