FF07,
The side panels you are going to have to build yourself or have custom made. I have done this, it is not hard just use the old (even crumbling) panels as a pattern and then get some marine foam padding and vinyl and use a staple gun with Stainless steel staples to secure the new material. If you are looking for older parts take a look at great lakes skipper. They buy old parts from boat manufacturers and work in the repair market that you now inhabit. Cool place in wisconsin called kendor marnine is where they are based out of. Great lakes skipper is their on-line store.