Re: Mixing too systems.
I would suggest if you wanna be taking serious as a mod stop attacking people on grammatical errors, I'd love to see you work in a place where english isn't a first language, you'd have a grammatical melt down. Regardless, as I said I struggle with these type of things I don't like being insulted on a daily basis on this stuff.
Regardless, even as a moon to leo, tug system it seems like it'd be far cheaper and efficient weight wise, to have one solar platform fueling multiple engines, instead of having a nuclear engine on every tug, or worst have massive solar arrays on each tug reducing it's efficiency, by increasing bulk weight. On top of that this type of mutual investments, I think makes each other part that much cheaper.