martyg

Looking at the size to the tail components tells me they will be functional. I think they should be installed and tensioned to help kept everything in line.

Two servos mounted normally in the bottom wing with a control horn from the top of that surface to the exact same position on the bottom of the upper surface using 4/40 rod is what is mostly used to connect the control surfaces. The location of the horns is critical to achieve equal throw of both. Using this method will make taking the upper wing off somewhat of a pain and may require adjusting of the rods necessary for any changes in the instillation of the upper wing. This may be one plane that needs to be kept in one piece?

As far as the incidence the plans show the centerline of both wing are parallel to thrust line. Therefore I am assuming that there is 0 degrees of incidence. However I agree the plans say nothing regarding this subject.

I'm not sure what you mean by down thrust?