That's good you posted those pics, especially the second one, hehe wow that would be fun to ride
The second picture looks like the axle can be somewhat customised, I have a couple of hub motors that you can modify it.
It doesn't look like you can with the GM wheels? I'm really not sure if the axle can be changed..
If I did build the trike it would be a font cast wheel, then probably a HPM5000 (or 2 lol) on the rear as the rims would be taking a beating around the bush tracks near me
Did you have any more info on the trike? Like brand/company etc. and where did you find that second picture haha