Nothing wrong with the type of STOL you're describing. It just means none of the ones mentioned so far fits that category, including the Zenair. You are going to have to design it to be very streamlined and aerodynamically clean with high aspect ratio wings, along the lines of Lancairs. Andy's designs are good start point, but you're gonna have to simplify the heck out of them. I often thought of enlarging Andy's design to around 80"-84" span, so I can put a good size gasser on it. However, the daunting task of cutting and shaping all the high-lift parts makes me shy away from it.

I do think you've got the right idea about the speedy STOLs, because the unfortunate fact is, there are already non-speeder STOL designs on the market. Just about any Stik-type plane with quad flaps will take off and land just about vertically in 10+mph wind. I had a couple of World Models Super Stunts that are great fun at doing exactly that. The simple flaps are crude but very effective.

Your kind of STOL will take some clever engineering to possess a ultra wide flight envelope and still remain relatively simple to build. My suggestions are to make sure you scale it large enough to:

1. make the Reynolds Number work in your favor

2. make the parts large enough to be less fragile and easier to shape and handle

3. most importnatly, allow high enough a price point to let yourself be profitable

I don't think .46 size is gonna do that for you.