Very familiar with the RL universe and I to have a copy of that Leviathan ship book, but alas I have just started playing SEIV and wouldnt even know where to start on making suggestions.
So new to this game overall I just made a major blunder Last night. Played 14hours straight when the game glitched, I thought no problem as I had autosave turned on.... Wrong! I had turned it on for a previous game but didnt realize it didnt save that state

Oh well at least I learned some of the tech tree.
Hmmm thinking on tech.... TOG is based off the Roman empire and the Commonwealth is... hmmm loosely based off of Great Britian? Anyway at least for TOG if your really serious you could study up somewhat on the Roman empire and what they managed to build and their general state they took technology and modernize it.
Sorry remembering as I type. ToG preferred missle weapons so you could focus tech in that area and RL\commonwealth liked lasers and MDC's if I remember right.
OT kinda. Playing with the idea of learning programming and putting Centurion and Interceptor on my comp. Loved Centurion and I have source books for vehicles so maybe one of these days.
Malagon