(sorry if anybody mentioned it earlier) how about instead of adding new units give ships some droids, so you can see them on the hulls repairing damaged units, and after that getting back "inside" ? ... in HW2 ships were only slowly regaining theit hit points, but maybe droids culd be usefull also for the gameplay itself ? you could for an example order fighters to aim droids as a primary target while attacking a ship (sorry for any mistakes, i know i could use some eglish lessons )