If you end up having to go to Denver you may want to try Inflatable Technologies: Inflatable Raft Repair Specialists - Boat Repair
They replaced two I-beams in my floor and patched about 40 leaks in a used raft I bought this spring. They were recommended by a friend of mine who is a total raft head and I trusted his opinion and it worked out fine.
They patched the leaks from the inside so it looks great. The I-beam replacement left a Frankenstein patch down the length of the bottom of my floor but this boat stays hard for days and the floor is working out fine.