Yes Brodak makes 8 different 3 line bell cranks and its not because there is 8 different ways to use them. I would say that there is at least 40 different ways to use the bell cranks and if several of us got together the count would go up and up I'm sure. For a short answer if you are going to mount the BC on the top of the outside wing behind the fuel tank you would use Brodaks's ''BB-376 2 1/2'' upright short span three-line bellcrank. If you are going to mount it on top of the inside wing you would use ''BB-382 2 1/2'' upright short span three line bellcrank.
   The wings that I build for carrier have a d/c section leading edge which means that the forward part of the wing has 1/16'' sheet top and bottom from the leading edge back to the top and bottom spar location. Then the area between the ribs and the top and bottom of the spars are sheeted with caps (spar caps) out around 8'' on each side of the wing. For spars I use 1/8'' by 3/8'' spruce top and bottom. My ribs are made of 3/32'' bolsa instead of 1/16'' bolsa only because I'm getting older and tend to break the 1/16'' ribs while working with them. I put the forward leading edge cap sheet on top of the ribs and back over the spruce spar to within 1/16'' of the back of the spar. Then I put a 1/16'' by 1/4'' or 3/8'' cap on top of the ribs from the leading edge cap back to the trailing edge cap. I use another D tub for the trailing edge and a trailing edge of 1/8'' by 3/16'' spruce. May sound a little heavy but most of my profile planes weigh between 44 and47 oz. and thats with a Nelson engine and Power Thrust Muffler combination that weighs almost 17 oz..
   Having said all of this, I only live about 50 miles from you and could easily come up and give you a few pointers. You would need your reduced plans and a bunch of copies on 11' by 17'' paper(from Staples or Office Max,ect.) of the reduced plans so we could scribble on those paperes and not your plans. eric