Originally posted by Crashem
there is a way to shim the dihedral angel.
1. place wax paper over plans,
2. next pin one wing half down.
3. now set other half next to pinned wing and raise wing tip to correct hieght for dihedral angle. after making sure everything is correct reglue wings together then continue sheeting and consruction.
PS if it is a "little off don't worry. In all the years I've been building I've never seen a model that was 100% perfect yet amazingly enough they all flew great. 
And if you have already ordered the wing kit then you can build a "spare" and swap wings if you are not satisified with the original at a later date. Just my .02
The sheeting is already done, that's the primary reason I'd like to avoid messing with the inside ribs.
So, there will be a large, /\ shape gap if I do what you recommend. Can I insert a rib-shaped "shim" to fill in the gap?