I scratch build a Cub that may work for you. I don't have actual plans, I just took a wire drawing a scaled it to make the fuse about 30". I'm on my 3rd version of a wing. The first I didn't build strong enough & it started to flex after many flights. The second was too big, made it a floater, too hard to land. Wing V3 is about 40" x 11", by far the best of the 3. Fly's great, easy to land & capable of some acrobatics.
I use the TLAR building method (that looks about right) . Here are the wire drawings, feel free to use them if you wish. This shows the V1 wing, it worked great but may be longer than you want.