Edward, lines are pretty much all you're going to get for a boat that age.
It looks a little tubby, and the spoon bow makes it more yacht than working boat even though the tubbiness is more working boat than yacht. I would suggest you get honest with it and sail it purely as a vintage-style pond yacht, albeit with R/C.
Have you checked the Vintage Model yacht Club? They have a lot of this sort of thing. Under the aegis of their boss, Russel Potts, they seem to have blossomed into a very active group.
BTW, that's Braine steering, not vane. Vane has a big blade sticking up which wouldn't work with that gaff boom. Braine was essentially an anchor shaped bit of brass or copper which worked between boom and rudder.
I'll have a look and see if there's anything in the book I mentioned, because American yachts did tend towards broad beamedness, if not actual tubbiness of section. The old "skimming dish versus plank on edge" argument.
Regards,
Vintagent