That sure is one of his bikes,and it was for sale a couple of months ago.You can use a smaller say 20 " or even 16" rim,and get the same thing done.Even use a fat wide belt they look so cool.You just have to find the right size to fit the frame,and make the tabs to hold it on.
The last 2 whizzer sheaves I bought cost me over 50 bucks,and then you have to spend about another 14 dollars for the hardware.The older whizzer sheaves also take a centering jig to mount.They also don't stay on all that great.Theres a small tab,and a thick flat washer thats holds it in place.The newer ones are mounted alot better,but are stainless.It locks every 2 spokes to the sheave.It uses a much better flat clip,and clamps the spokes down to the sheave. I've mounted several with no jig,and only one was 1/8 off center.I used a yardstick(metal) to check it gave it a small adj.,and retightened it. Rod