glueing ribs in up-side-down?! tut tut! (shaking finger at computer). anyway, i found that when putting the wing together, i foloowed book mostly, it was useful to use that nice blue masking tape from the hard-ware store to hold it together while you set it up. this is better than tacking with thin CA because you for CA to work best, it needs to seep in, and the final bonds are weak if you have already sealed the surface before hand.

Just my 2-cents...

Crazy Mike