well that depends, what draft are you looking for?
You gonna take if down rivers in cambodia?
What type of main gun are you looking to mount on it? the G-pig? I would recommend the Ma duece, for those times your behind enemy lines all by yourself.
Are you lone wolfing it? or looking to carry others on you recce's?
and finally what are you looking at for propulsion? 2 200hp outboard?
yeah, id start at Canadian tire or SIR.
Oh and lastly are you wanting it to be air droppable?