ok sorry pic is hard to see... Basically this is it:
top picture:
yellow area is very narrow and gray area is the wide, rounded hull part
pink line shows how the rounded part will swoop down
those dimensions are estimates of how big each part should be

bottom pic:
yellow is solid foam
blue line shows what part will lift off to access inside of hull
green is water pickup
red is rudder and drive cable obviously
I plan on gluing in some blocks of wood about the drive cable to make a shelf.. a piece of balsa will be set on the block of wood to make the shelf where the radio box will lay.. this will make a straight shot to rudder while making drive still accessible... this setup should allow there to be a straight shot for the stuffing tube and drift shaft with no strut... should go straight out the back I don't understand how the throttle servo/esc/electric engine works... explanation is much appreciated.. thoughts on this? (sorry if my design is confusing)

pictures should give a rough idea of my plan hopefully allowing someone to find areas that will surely cause major problems
thanks for the help!