Shipbucket

You might be able to get away with offsetting it to starboard so that at least a vehicle passageway can go through. You'll have to then put something to port to maintain proper balance. Maybe engine rooms and funnels - it'd be awkward but it might work. And probably a somewhat complicated series of ballast tanks to keep things level when ammo runs dry or gets topped off.

I will design a new LST.This is the better solution.