Myself and @Beale are collaborating on a modular part set for very heavy payloads, based on Energia and its prospective derivatives, using a 5m diameter core and 2.5m diameter boosters. Download from SpaceDock (1.2) Download from CurseForge (1.2) Download from Dropbox (1.2) Part List With this part set (and some stock parts) it is possible to recreate your own versions of Energia, Energia-M, Vulkan or Zenit. That doesn't stop you from making anything else you wish usin