Is it possible to replace front cap on a C to make it a B+?

This is a most interesting point. I would be interested in converting the cab overhang to a one piece fiberglass shell that stops at the front of the cab. I have nothing in the cabover...by design. During my looking process I learned that this area is prone to leaking. I've certainly learned that! I use this space for minimal storage: no sleeping. I want Winnie to stay a C...am tired of dealing with leaking!