The 3w100 should be just right! What I did for the cowl mounting is cut a 1/8 ply solid ring that matched the supplied pieces(I think there are six) then used # 10 socket heads with blind nuts in the fire wall. As for the servos I used Hitec (4)5625 digitals in the wing, too much surface for one ea. The wing mounting idea sounds good but there is a advantage of using GP's mounting. You can make spacers for each wing that will let you change the span from 100.5 to 103.5 and have two mounting threads in the alum. tube depending on what type of flying your going to do. When there outward you gain about 45 sq inch in wing area with no adverse affect(I checked with GP before hand that said no problem). I'll post some pics tonight.