currently I am building the RSM Mosquito kit - and doing a build article as I go - but....

I have  hit a snag with the flap horns in that, as they are on a swept forward trailing edge and have very little space between them, they touch in the middle when full up is applied.

what is the best way to get around this problem? 

matt - it is not possible to sand a flat in the trailing edge - the design does not allow for this. also. if I did that, it is not physically possible for the control horns to go into the flaps and have movement both ways without twisting and therefore breaking the flap.   even with lucky boxes installed to allow for some movement - the forward sweep is such that the movent in the horizontal plane when the controls are delfected would require a lucky box approximately 2" wide to allow the full range of motion

Wynn:
Sounds like your only choice is to splay the horns some.  In the rear view bend them a couple degrees so they lean apart. (bend them the same amount)  That will let them travel a little farther before they touch.

Not elegant but it will work...