hiya barry most of the m t b i have worked on are twin motors twin shafts as you said you had
twin rudders the range of motors is depends on the speed and the battery setup plus what room
you have in the hull i have seen them with all sorts of motor and battery setup s but keep up
the good my m tb has twin 545 motors running on a single e sc and a 6v 4amp battery
but if you use bigger batterys and bigger motors hope this helps mick keep asking the
members as they will have all sorts of ideas