I am relying on memory here. The motorwhaleboats are 28', the launches/gigs are 38', and the open utility boats are 50'. My best guess would be that all were wood hull. Today, all are fiberglass. the whaleboats in 1/350 would be .96", or about 31/32". About.48" in 1/700, or 31/64". That was two lifetimes ago ( OK two carreers ago ), so please correct me if I'm wrong. Google "whaleboat", for photos. I have found pics of the 50' fiberglass boats, wasn't looking for the wood ones.
Pete