A Space Tansportation system themed quick transport for all planets next to Nauvis. This variation of Bruce Burton's US Space Shuttle tribute gives full-width legendary thrust at 450+ km/s for <800 tons, though it will need to be tweaked from a scheduling perspective, with ammo being a top concern.
I also re-worked the fuel for advanced processing, dumping excess sulfur and ice directly to prevent fuel bottlenecks (see https://imgur.com/aYeZnfy), and optimized some slowdowns in fuel & ammo production, including belt optimizations, legendary modules/furnaces/assembly machines, etc.