Shipbucket

Ok, so I'm starting to draw JG scale ships, (I previously attempted to draw a LCAC but that got lost due to technical issue )
And I am stuck at this point, I have no clue how to detail the hull. The shading I have on the hull is temporary and I will get rid of it, and the 50 cal in the rear is also WIP. Any suggestions on how to detail the hul? any tips on the over all design? Please any help I can get would be so very appreciated.
Note: this is a river gun boat design. It has a 30mm cannon and a long range air radar on it. I'm going to be designing a version that can be carried by a larger warship (say a cruiser) and deployed that will be a much more traditional design with out the air radar and 30mm.

Anyway thanks a ton for any help I may receive

It's a nice design, but I do not think that there is enough hull under the
bow/forward turret for the power rotation/elevation mechanism and
the magazine.

Yeah i mean to remove it and replace with a 20mm. what else do I need to add to it?

aren't bigger than CB90-class fast assault craft (google it), it's enough with two-three 12.7mm more than that is overkill. and perhaps to heavy