I agree with ThrmionicScott. The wheels in that photo of Velocio look more like 20", rather than 24".
With that, I recommend checking out the frame/fork that Simon-Bikes .de developed based on the 406 wheel size. I have one, that I'm still piecing together into a bicycle but can tell that it's good quality. When used with 50mm tires, this wheel size is quite respectable. It's a good ride and the tire size will always be available (whereas the 24" one might not have either of those qualities). I could've had a Velo-Orange Neutrino but the Simon-Bikes mini-velo, with its touring-length chainstays and reliable V-brakes, was more appealing to me.