I will finally join the servo sub club. I will also start with a dual 12" H-frame and I'm very excited to get started! The second one will be added at a later point. Will use this build to improve my poor wood working skills. If all goes wrong, my back-up plan is of course to buy the the nice looking CNC cut frames you offer.
I noticed on the GR Research drawing that the brace location is off-set between front and back but it looks like the dado you cut is straight across? Is the only difference the total height of the H-frame - 26 3/4" vs 26"?
Thanks again to you and everyone else who has shared their builds for the inspiration!