I wanted a platform for my '68 41C when I got her. With much research, I found Beach Comber Fiberglass out of Ft. Lauderdale. They had the specs for my specific hull on file, and made an excellent platform that fit my needs, and mounted to the boat as if it belonged there. It was an interesting job as the boat has a curve transom, that it pitched to the rear, so the platform had to be right, and the brackets had to account for the transom angle.
I would buy from them again without hesitation, and don't have to scrub and oil, or sand and varnish a teak platform.