I just sketched up the retract and servo installation for the 43" span T10. I didn't find a problem using the standard rib spacings for the GP mechanical retracts but wheels used are 1.5" which should be fine on pavement. The wells are 1.75" but I would suggest making them from 1/64" ply rather than 1/16" balsa. Just to allow a little more space around the wheel. It should also be fairly easy to slide in the rolled ply into a round cutout in the bottom sheeting.

I also pulled 3 of the original 11 ribs in the outer panels. I think the 43" span wing should be fine without them so long as shear webs are used out to rib 6 (the new #6). The last web will be rather wide but I think that's ok.

What retracts are you waiting for Phil?

I hope the drawing helps.

David.