Hi Denzil,
Have you read the May 2013 Model Boats magazine? there are two items on converting plastic kits to r/c, a 1/700 KM Bismark and a Revell LCM 3 Landing Craft. Plastic magic has become popular recently and there must be many more items prior to these.
Action Electronics market products specially for these conversions, on their website speed controllers and micro motors can be found.
Hope this is of help, Tony.