When I built my wings I didn't clamp the bottom spar until I was ready to rivet the top skin in place. The match holes kept everything straight and square. One precaution I did take was to put a cleco in every other hole and when I riveted I tried to make sure there was either a cleco or rivet on both sides of the rivet I was about to drive.
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Bill--
Allowing the bottom spar to float seems like a good idea since the skins should square everything up. I think I'll try that too until the skins go on. Thanks for the tip.
Where you put a cleco in every other hole, is that where Van's suggests 1 cleco every 4 holes? I've wondered why the instructions said only 1 every 4: whether it was because Van's suspected we'd be running out of clecos if we did not or whether clecoing farther apart gave the skins some room to float or something???? Unless I hear otherwise, I'm going to try to use a cleco every other hole as I have up to this point.
Steve