The updated Sea Queen still available from various suppliers including https://www.cornwallmodelboats.co.uk/acatalog/sea_queen.html
I restored one of the originals from a wreck a few years ago. No propshaft or rudder had ever been fitted, the propulsion and steering was via a small electric outboard motor on the transom. Don't want to hog this thread but a couple of photo's before fittings added and a trial fit of a home built ( not by me )15cc 2 stroke engine. Had my arm twisted to sell the boat but kept the engine.