75 tons was ridiculous and honestly we never should have released such a bulky monstrosity in the first place. The new Deliverator Slim is now a mere 73 tons!
Turns out the amount of water produced from melting ice is 20, and the amount of water needed for fuel and oxidizer is 10 each. So instead of cycling between fuel and oxidizer with a water override, we can just cycle to run one of each recipe. No storage tanks necessary!
R&D was also informed about a width issue with previous designs. With the removal of the water storage tank we were able to dramatically improve aerodynamics. For very brief periods of time while flying towards a planet, this sucker can hit 50km/s!
How fast can it make the Kessel Run?
Well the 12 parsec shortcut is common knowledge at this point. That's about 3.7e+14km, say 40km/s average speed because acceleration doesn't seem to be a thing in Factorio for 9.27e+12 seconds, or a little over 293,000 Earth years. As long as the flight path doesn't include having to shoot at asteroids I suppose because this model can't self sustain ammo, or maybe it needs a fleet of ammo ships sent to keep it supplied...