Sir, where have you been all these years?! I'm afraid that you are another victim of that horrible monster called 'Obscurity.' You should be way more popular for the quality of your MOCs. Keep on brickin'!
Cool design! Gatling guns are the way to go in this application. Those A-10 Warthogs have them, and the Phalanx CIWS on US carriers are a Gatling, too. Surprised you didn't go with a skinny tail at a 45 degree angle, you know, for stability and all.