I built this 1/125th scale Amati kit of the Titanic over two years from 2016. it has enhanced etched brass details from Minibrass. Conversion for radio control involved making the hull waterproof with multiple layers of fibreglass cloth bonded with epoxy resin as well as the installation of a drive train and RC gear. With only a tiny rudder, steering is dependent on a mixer unit controlling the differential speed of the propellors.

bought this 50inch hull off ebay and thought I would try a make a boat just with my own idears and this is how it turned out,powered by a 720bb motor,12inch propshaft and a 60mm 3 blade brass propellor.all built from odd bits of wood in my shed. installed wood in bottom and then filled with a two part epoxy resin

This is my second attempt at scratch building using a a grp hull. My first boat was an MTB/MGB built on a Perkasa hull as a semi-scale model. (see All things Rc - Power setups).
This time I have concentrated on keeping things lighter but it still weighs in at 2.5kg!
I have built without plans, relying on internet photos scaled etc using "Photo deluxe" and "Photo Express".
Virtually everything is built from plasticard apart from a 3mm liteply deck.
The dinghy is epoxy resin and microballoons, ths scramble nets are Lego!
Power is again courtesy of Graupner -2, Speed 600 8.4v using lh. and r.h 35mm props. Esc is one of those 50amp ones from the far east. These are far cheaper than the Viper Marine 40 used in my MGB, but slightly heavier and less sensitive at low speeds. Current drain (in the bath!) is up to 30A but this gives a superb on the water pace of an, estimated,8mph. Battery is a 4,600 mAhr NiMh.
(A true scale speed approaching 150mph plus).
I sail it on Ullswater in the Lake district and the Vosper Perkasa type hull shape is superb in the real waves that we get there, flying over the crests and taking aboard No water!
It really looks the part as my photos would show if I could learn how to load more than one! Can anybody help with this?