Well you said it would be easier to go and build out of fiberglass anyway so why not the fender's or wheelpants also. Sucks but hey it will look right and you couls use the tire size you want. If you have an old aircraft bone yard close go there and just look as some bigger aircraft had biggerwheel pants. I don't know of any on the eastcoast near me but in ohio I knew where a couple were. The stealth would be ahelluva lot easier. I still say the fenders of an old car with the added sheet metal work would be a little better than fiberglass work, but thats my stand No matter what the builder better be good at his fabricating of parts or it will look awkeward.
Cecil