Tater, this is really not much different than a built up wing having strength issues with retracts installed. the weakest area of most wing structures, most will agree, is in the retract are PROVIDED that there have been no mods or strengthening work done. Iam currently building a TF.60 P-47 and the bays around the retracts didnt look strong enough for me so Iused some spray foam in those bays after sealing them off to help add strength. Ihave no experience with park flyers and none with foam so Iam sure that a guy with knowledge in that area will have some encouraging words. if you cut away an area of a wing like that, its bound to give up some strength.. sometimes its nearly insignificant.. other times it can compromise the structure if you did some major surgery.. I wouldnt think you would have significant issues if you go that route.. just my 2 cents..