Options for roofing?

Okay, after a lot of frustration trying to figure out what to do, I have decided to build around the tires on my tear to make the inside wider. I put the tires on the axle last night to figure out how wide it will be from the outside face of one tire to the outside face of the other, and it came out to about 70". Of course I thought I could stay in the 5' range, since it is easier to find aluminum in that width, but I think it won't look as good if I only cover the tires halfway. I can't seem to find a good solution for fenders if I go this route. So....if I end up building over the tires, I will be looking at going anywhere from 66" wide (I can use a rubber fender extension, similar to what Mike used on his Baja Benroy) or I can go 70" and just trim around the well with the same trim I will use for the lower edge of the sidewalls. If I do either of these I am left with the frustration of trying to figure out how to skin the roof. I really wanted to do wood sides with an aluminum skinned roof, but it seems like it is really hard to find high quality wide aluminum. I know someone in another thread mentioned going to a truck manufacturer for wider aluminum (103" wide, Lufkin Trailer manufacturing), but there was some question as to the quality of the material. I also remember seeing how a builder did his with a seam down the middle, but I can't remember who that was and how exactly he did it. I really need some help trying to figure this all out, I am totally stumped.
Amy

Amy