Joe, the RCM plan is available from Outerzone, free from there plus the cost to print.
Looks simple enough to scratch build. The fuse and tail are balsa, construction is mostly sheet plus triangle stock with a lot of sanding. The wing is foam but patterns are included for hot wire cutting. Might be an option if you have someone at your club with a cutter. The plan has an address for where to purchase the foam wing, but it has to be outdated.
Alternatively, the wing could be built with balsa, just need to design the structure. Shouldn't be too difficult as the plan shows the root and tip rib sizes and shape, plus the dihedral. Its going to be sheeted with 1/16 balsa in either case.
Just an idea.