I think you should write that novel.
From the standpoint of space combat, I think real life technology has reached a point where the hard part is figuring out how to keep your characters alive for more than a few milliseconds once the shooting starts. Nukes, directed energy weapons of various kinds, extremely high velocity kinetic penetrators, nerve agents, small form factor explosives, microdrones, guided small arms, precision guided munitions, omnipresent surveillance, all aimed and coordinated by computer near-intelligences in an environment of hard vacuum and microgravity--good luck, Flash.