I didn't mention this earlier but I have a very messed up foot. My reason for learning to make shoes was do that I could make shoes that lessen the pain I have walking. I am currently working on my second and third pairs, one pair will be similar to the first pair we made in class and the other will be made using a pair of Birkenstock repair insoles. I have the lasts for the first pair. The Birkenstocks have a very oddly wide front to them, so I have ordered a pair of EEE wide lasts and I am going to reshape them narrower. I can also add to the toe area by laminating leather and then grinding it to shape. As to using resin, I think it would work. You will likely be using fiberglass epoxy resin, it is available and not too expensive. You will have to be careful driving lasting nails into it, so a wooden bottom may be good. But if you use a wooden bottom you will need to hand carve the bottom to be foot shaped, if that is what you are trying to do. Normal shoes are nearly flat on the bottom, having a slight arc left to right.