Hey i'm not sure if you were looking at my bike or not, but i could sell you a trailer fender all cut and and drilled and painted, ready to be bolted on. I'll even throw in longer top bolts so that you can add spacer to set the fender distance from the tire. let me know if you're interested. I'm not really sure what wheel size it was for though...
Here's my handy work: cut out for the belt and holes for mounting and places to attach the heat sink and other do-hicky underneath.
Here it is with stock size tire and no spacers:
and here it is with oversized tire AND spacers: