Kutter Telescope

Hi guys, the thread on equipment talk forum regarding unobstructed vs. obstructed aperture got me thinking.
I have something in mind; a kutter-design; anybody familiar with making this kind of scope? I would like to know of formulas for doing the math on this design, regarding the location for cutting the light path if that matters, the size of the secondary, how flat it should be,... Suppose in a kutter-design that the two mirrors have highly reflective coatings, like +96%. Would the remaining loss due to the second mirror anyhow influence the gain of the unobstructed lightpath? Would it matter very much if a third mirror (diagonal) came into play?
Lots of questions on this. I just figure for a future project an all-wood equatorial fork mount and wooden tube
kutter design with the eyepiece at a comfortable position at the back, on the side of the tube. This would allow for let's say a 12-14" f5-7 in a compact enclosure, unobstructed views and focal point accessibility, superb!
Also, I like to play with the NEWT program. Does anybody know formulas for the calculations involved, like for the secondary size and baffle-positions and diameters?
Ok, it might be hard to build, I don't know, that's why I'm asking here.. Experiences? Suggestions?
(I attached a drawing of some kutter designs.
Thanks
Nico

Attached Image:

I am interested in making such a design as well. I haven't ordered the "Telescope Optics" book yet, but I've been playing around with TCTWrite and Winspot, both of which have kutter schiefspiegler designs.

If you want something unobstructed in the f/5-f/7 range, why not go with the Stevick-Paul design? It scales well and with 96% reflective coatings on all 4 surfaces, you're still in good standing. Of course, it's not compact (focal length of primary determines focal length of system) and you will have to have excellent figure on all of the mirrors (1 paraboloid, 2 spherical, and a flat) to combat accumulated wavefront error.