Is this your boat you are thinking of overplating, or just general curiosity? Are you talking about overplating a whole boat, that is, dropping it on a new base plate and overplating the sides up to either the waterline or the top rubbing strake? Or just overplating the footings area?
Speaking as a retired boatbuilder, overplating a whole boat is not a sensible idea. If it was done the way I have seen it done at a yard that shall be nameless you'd be in effect building a hull that has no attached stiffening, has plates only welded from one side, and joined to the existing hull by a single fillet weld at the top, with no reliable way of testing for water tightness. Depending on the size and profile of the base hull you could make it wide enough to jam to easily in some narrow locks. Then you'd probably have issues with underwater skin fittings, and the skin tank if your engine is cooled that way. You'd be adding possibly several tons to the weight and would need to remove ballast. If to do that you have to partially strip out anyway to lift flooring you might as well strip out up to the gunn'l and do the job properly.
That said I have seen footings overplated on a Josher hull that was to become a trip boat. This was done under Board of Trade supervision, but the surveyor insisted that each plate had a pattern of 20-30mm holes cut, through each of which it was welded to the underlying hull. The boat in question was stripped out at the time.