If the barrel ends don't touch the water or violate any other rules for placement they should be fine. There was a ww1 Scharny with the guns armed int he casemates at Nats a couple years ago, really sharp looking boat and having the guns down low with almost flat trajectory gave him a lot of useful range. Wonder what happened to him though, I dont think he re-upped his membership this year.
Resurrecting and getting this discussion back on track, Panzer wanted pics of my under construction shop. We built this 24 x 24 out building for my older daughter's business,making fur-suits and leather armor. Then she moved down state. So finally moving my work shop out of the basement. I am using half of the building. The other side is a mess and I have to get that straightened up for my wife and other daughter. . still have to finish insulation in the ceiling.I have in floor heat from an outdoor boiler for winter.