The challenge here is to build a craft that can get to orbit twice without refueling, staging, or docking.
Score is based on mass - the lighter the craft, the better.
Bonus cookie points if you make an all rocket craft.
More rules:
You must come to a stop at KSC or the ground nearby between orbits. (Screenshot at 0 m/s on the ground).
Scoreboard:
camacju - 9.2 tons
I have an entry, which at 99.3T is going to be instantly in last place. However, it gets 16 Kerbals to LKO and returns. Twice. That comes out to about 6.21T per Kerbal, gets them all to orbit and back twice. It's not really optimized for this challenge, so on a per-Kerbal basis someone should be able to do better.
The Ship:
The First Orbit:
The Second Orbit: