https://imgur.com/a/eKor0Nn
https://kerbalx.com/d4s_over_dt4/ssta-2
Oxidizer drainable in case you have too much(for example,when launching from kerbin(and most places) you don't need any oxidizer.It's basically just there for tylo.)
Heavy use of drag occlusion and part clipping.For example all the fuel tanks(excluding the wings,which btw are better than the delta wings in terms of dry mass ratio and equal in every other way.I should really start using those!) are halfly clipped i