This mod provides you a new type of fuselage. The Cylinder Tank, comes with built-in bulkheads and skirts, are able to hold fuel of its actual internal volume which is almost 80% more than stock fuselage. Furthermore, you can select with what material your tanks are made of - which affects the empty mass, price and shell thickness.
This mod is a sibling mod of not-yet-released Mo'Fuselage mod. While Mo'Fuselage mod focus on more shapes and possibilities, this mod focus on reality.
Thanks for the clarification. I wasnt aware of RSS for SR2, found the page and I'm eager to see the immending next release ! I m now hyped ^_^