AFAIC, this mod is mandatory if you like realism. Thank you so much! Squad should be paying you big bucks and folding this into stock.
small thought on the RE L10: I like where you are going with this one, making it an RL-10 analog. I'd like to see a sloped 2.5m thrust structure akin to Centaur. And maybe a quad thrust structure akin to the SLS Exploration Upper Stage. On the flip side, I do like how you made this and the Skipper able to fit 1.5m tanks.