FWIW,
Pat Johnston and I had many conversations about this very thing, that being adding dihedral to the already built wing.
I have done three of them, it takes about oh an hour or so to do. It is very easy, and I know from mine, I have stuffed two of them hard in the ground, hard enough to disintigrate the fuse and the wing modification never showed any signs of letting go or failing.
I did a phot essay on the whole process here on SH several months back.
Here is a link to it.
http://stunthanger.com/smf/index.php?topic=4931.0if you have any problems Doc, or it doesnt make sense, email me, or ask here
I am a strong supporter of this wing and its benefits, of course, a wing by itself is just a wing. I know my first one , the Q modified P40, weighed 59 oz due to some finishing ignorance on my part. It flew fantastic even at that weight with a LA 46.
check out the pictres and let me know if it makes sense to you