[link]http://www.rcuniverse.com/forum/fb.asp?m=9043744[/link]

Hi Chemie - I had the same issues with G1 (see the above link). I would suggest using your square for all the ribs except the root ribs and for that use G1 so the the upper spar is shorter than the lower spar so when the wing is being joined the correct dihedral can be acheived without a gap between the root ribs.

I measured the 3/8" from the end of the ribs and used a piece of balsa stock to mark against. This is to set a line against which to set the TE sheeting, not really a big deal.