Just a quick run down on wheels, this has always been one of the areas that has given me fits when starting to build my own vehicles. Several methods have been suggested to me from a variety of sources, all valid just, not quite in with my internal work process.
So this is what I have come up with. The beginning is a round of epoxy putty, in this case magic sculpt. The round is pushed down on a sheet of plastic then a bit of brass rod is inserted as near center as possible. This is set aside to cure.
Once cured the rounds are mounted in a Dremel tool and then lathed to shape.
I experimented with a number of different tools, a carbide tipped scribe and micro chisel where the two most effective tools for gross shaping. Fine shaping and smoothing was achieved with various grades of emery cloth.
This method produces smooth wheel. Do to the hardness of the cured Magic Sculpt I am thinking a mix of it and Greenstuff to produce a end product that is less hard. But since I have a full set I am going to do a build with these wheels.
My next attempt is to produce the smooth wheel, then go back over it with green stuff to provide the detail.