I think you may run into buoyancy issues if you fit a another dual 40mm on the stern.
You're already carrying your engines and the NSSM launchers aft, which will force the bow up. This'll make it very hard to get the ship to plane, and make it extremely unhandy at slow speeds.
depends on the hull.
Yes, but you all the heavy equipment aft in the least voluminous end of the ship. At the same time you have very little equipment in the bow, but plenty volume. So unless your ship is build of magic floatainium or you have an absolutely ridiculous amount of ballast out front (Something you want to avoid on a warship) your ship is going to try to stand on end.
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