Interesting write-up.
I also would have liked to see some empirical data eg:
How much does each focuser sag with a 1kg load? How well do they support a 5k load? Does the 10:1 slip? How much image shift with the locking clamp?
What is the FWHM of stars with RGB plus clear filters? What about narrow band?
How about some intra and extra focal images (green filtered) with a spherical error estimate?
Vignetting data, ie % roll-off on say a 35mm sensor.
Field flattness using CCD-inspector? With and without a FCC/TCC?......yes, I ask a lot of questions...
