> ... For testing the R-C I'll need to build a caustic tester...
For the primary I can lend you (since we're in the same town!) a supposedly well-characterized lens for doing a Ross null test. I have software that calculates placements for mirror, lens and knife edge and I think it will work for any conical including the R-C hyperboloid. Some people don't like the Ross test and because this is an untried lens (and since presumably you don't intend to launch your telescope into space), you should use it to confirm another test.
For the secondary I'd polish its tool to make a concave sphere for an interference test, a la Couder, but you could finalize the secondary figure in combination with the primary using one of your 10 inch flats as an autocollimator.
So for the R-C you could have two independent tests for each mirror...that's pretty good.
A Schmidt secondary that isn't too curvy (i.e. if the primary isn't too fast) can also be tested by interference against a flat. It's a bit tricky because there are lots of rings and they're close together. I have a old TM article that describes the technique.
Aart M. Olsen aart@uiuc.edu 217-333-7467 College of Veterinary Medicine Univ of Illinois at Urbana-Champaign