Mike,, you may limit your desirability by sheeting the leading edge,, I am pretty sure that would constitute a change and make them unsuitable for OTS, my understanding is that the model must appear identical on the outside,, a sheeted leading edge would be visible,,
Could be wrong,, just my understanding
Yes it would be looked down upon. Make the kits as per the originals. Any changes to be made, leave that up to the builder of the kit.
A kit mfg. should try to make the kits as close to or exact as possible to the originals.