Chaparral . . .
Post some pictures if you have some (may have to re-size them to about 250 KB)
@BaylinerChuck just finished off a restoration of his Chappy, so check out his thread. Most folks use polyester resin for the rebuilds and a variety of chopped strand mat (CSM) and stitched cloth (like 1708). Check out the various threads of similar boats for how folks installed the wood for their new transoms.