would a bop head be the best choice? Have you thought about elminating the neck (or thickening it) and using the odd looking heads like what's on desty's fasa romulans? Just my opinion but a smooth head feature would seem to match the rest of your ships body more so than a bop head which has alot of small detail, it just looks to advanced for the rest of the ship. Certainly you could keep the bop head design for a raider allaince/pirate.