RE: LT-40 bash
Use the 4*60 wing, but clip the tips one rib. As big as a 4*60 wing is, you may need to take off 2 ribs. The fuselage length should be around 75%-80% of the wing span. Measure the fuselage length, then divide by .75 and .8. The span should be in this range for a sport lane.
Also build the wing flat, no dihedral.
If you don't have an incidence meter, after you make the cutout for the wing saddle, get a small level and put it on the stab.
Prop the tail up until the level bubble zeros. The stab is now level.
Measure up to the exact center of the LE and also to the exact center of the TE. These two should be exactly the same measurement. Check the level to make sure you haven't moved the plane.