Makes my eyes hurt just thinking about 1/4800 scale. 
That, and, as at 1/1200 and 1/2400 scale, you will wind up doing a considerable amount of terrain modeling. Whic will include (or want to) buildings, airfields and the like. 1/4800 aircraft would seem hugely daunting, but somewhat necessary to the dio. 40’ personnel boat will be 0.1" long, and there are many needed if depicting, say, 6Dec41
There are some nice products available these days for modeling terrain (like celluclay) and water. Check the model RR section of your local hobby shop.