Chuck Cunningham designed this as a small version of the Lazy Ace. I built one a long time ago, and it was great. Radio installation is a bit tight, but not too difficult.
Order standard parts for 2 stroke or electric. Order alternate kit for 4 stroke engines. Alternate kit has longer cowl doublers and taller firewall. Move the firewall back 1″ for four stroke version.
Also, you can order the standard rubber band version, or the alternate version without the rubber band rails at the top of the cabanes. If you want to build your plane for bolt-on wings, you will have to design your own cabane attachments. Here are a couple of photos of the underside of the top wing of my Sporty Ace.
For a complete description of how to build these struts, look at my wire struts article.
Here are a few photos of a Sporty Ace emailed to me by a fellow who was fortunate enough to find a very nice model that the builder never got a chance to fly. He says it flies great with a K&B 40.
And here is a Sporty Ace that I built from my own laser cut parts. It is arguably overpowered with an OS 52 Surpass.