Thanks for sharing.

The mismatch you're referring to is normal - most tricycle gear airplanes have a smaller nose-gear wheel than the main-gear wheels since the mains carry a majority of the load.

Passing on a technique someone told me about to improve the look of those Dave Brown wheels: stick the wheels in the freezer for a while to stiffen the foam tire, find a long screw and nut to use as a mandrel that fits the axle hole, then chuck each wheel up in a drill press. With the drill press running, use a Dremel and sanding drum to shape the tire and give them a more pleasing rounded cross-section.