Hi Colin, what scale is it?
If you Google 'Plastic Magic' you should get lots of example of this from 350 / 400 scale carriers and battleships down to 72 scale Vosper MTB, KM S100 / E-Boat etc. There are also several Plastic magic articles in Model Boats magazine. The general principles are always the same: lightweight miniaturised electronics incl. servos! Do a max payload test on the bare hull as the very first thing. Weigh the major superstructure assemblies and decks and subtract from max payload: that's what's left for electronics and battery!
The kit props are generally useless, no pitch, so make your own out of tinplate or 0.5mm brass. can be a little oversize, no one will know😉 Prop shafts and tubes: 2mm OD / 1mm ID brass tube with 1mm silver steel or piano wire shafts. Couplings from shrink sleeve. will dig out some motor types and sources tomorrow, there are also some given in the Model Boats mag articles. That's where I found the Micron Radio tip😊
Can heartily recommend Micron radio for the smallest combination RX and ESC on one tiny board that I've ever seen! Talk to Andy Rutter, he offers excellent advice and will fit tiny connectors and pre-program the RX board to match what you want to do. He also has very very tiny servos which are ideal.👍
http://www.micronradiocontrol.co.uk/
Look under RC components - 'Deltang Ultra micro'. you ain't gonna get no teeny weenier!
I went weak today 😲 and ordered a 350 scale Prince of Wales, to match my 350 scale Bismarck, Hood and Ark Royal. Battle of Denmark Straight here we come! Cost a tad more than 25 pence though 🤔 Good luck Doug 😎