I have built 3 combat planes, Euro style; but have 9 more to build. These are the foam core leading edge, with just a few 1/8 balsa ribs, spruce spars, spruce spar trailing edge. Cutting the parts is no problem. Even with so few parts it still seems to go together slow. Making sure things are lined up seems to be the task that slows things up. What building techniques, secrets, or building jig am I missing?