Why not hire a squad of snipers with high powered rifles to join the crew as security? Surely "Soldier of Fortune" readers would line up for the work.
Probably a few .50 BMG mounts would do. Though I like the idea of bringing back Q ships where a screen drops and five inch naval cannon swing around and fire!
Topcat Marine Security: A Very Crowded Office Space, a Shell Corporation, or Just a Scam?