Manzano Lazer Works is still selling a short kit for a 45 inch span Sopwith triplane. Problem might be the electric nature of it but it should convert to glow without too much problem.
It's a Peter rake design. The short kit with plans runs about 90 bucks. Not too bad. If you go to the Monzano web page there is a link to a build thread and you can get a look at how it is designed and built.
Good Luck, Dave