Well hear it is, I started from scratch on my modeled uni, wasn’t happy with the previous product, All I got to do now is the stem clamp, and the seat. But I think the tire is just a little TOO big ^^ So i’m gannan make it a little thiner. And yes it does fit on the rim, and in the frame.
Frame looks as if would be a bit springy but with a little reinforcement I think the desing would work. The seat tube would perhaps also need another attaching point.