I know this may sound silly, but there should be some way, to get xenon from some sort of air intake or something. Also, maybe some different solar panels/ ion engines? I love all of these things. I love efficiency, can you also maybe add just overall more efficient engines? Oh ,and stock life support if u have time *wink*
I understand that it has to be realistic, to me the more realistic the better anyway, thx
-Me-