does having them made out of wood or glass effect the ride…
To get a proper foil on a double sided foiled keel fin, you need some thickness. Wood allows the thickness for the foil without the weight of fiberglass, Plus it looks so DAMN good!! aloha, tom
I’d suggest using 1/2" baltic Birch Plywood… With it you can see your foiling real well… http://www.hollowsurfboards.com/ 
is it possible to buy the fins from anywhere, im not that confident when it comes to fins and foils ect.