That's quite a job, did you take any pics of the wheel with no wood on it?

Sadly..no..

but it has a 6,5 mm steel ring welded to the 3 spokes.

I took 6 pieces of mahogany and shaped this around on a slab of wood, this I did 2 times. the front layer with a cavity of 7 mm and the rear ring of 6 parts solid. This glued with 2 components glue. the ribs on the back I've made with the help of a powerfile. al the work took me 36 hours!