Why not fabricate them.

The front spokes are just a series of flat strip bent into triangles, the short edge following the rim and the long edges concave to form the spokes. Plenty of Portable engines done that way.

The rears look like the spokes are just round so easy enough to fabricate from rod or tube

Good image here for anyone that does not know what they look like.

J

The originals would have had the hub cast around the spokes.

Your easiest option would be to cut slots in the hub to locate the spokes and silver solder them in place. If you bend up triangles then the curved outer edge can be soldered to the rim though the originals may well have been rivited to the separate tyres. Another option would be just to use arc shaped spokes soldered into the slotted hub and a slotted rim which will possibly be easier, just turn a raised section on the inside of the rim to represent the flat bar.

If you do fabricate then make the hub wider and a smaller bore than required and the rim bigger, you can the put the whole soldered assembly onto the lathe and true it up as if you were machining a casting

Fizzy,

Have you settled on Invicta? Don't you think this would look superb at a large scale (nice normalish wheels)? Lovely colour too.

PhilH

Jason,

Yes I would imagine that the wheels are not such a problem and I would imagine the engine would perform as well as the Rocket that I saw at large scale.

PhilH