I managed to create a larger version of this craft, its much heavier but manages to get to orbit with 1000+ fuel and a few doodads. It uses a similar ascent profile. 1)Throttle to full and reach about 100m/s 2)nose up to 10 - 20 degrees and pull off the runway (to aggressive a rotation will destroy the turbojets) 3)Slowly nose up to about 45 degrees and hold using sas to approx. 10km 4)Activate the Aerospikes 5)Deactivate the back center tank at around 22k to kill all 3 turbojets simultaneously, the tank should be about empty 6)Do whatever orbital insertion pleases you 7)Should have enough fuel and rcs to do whatever pleases you (except maybe landing it on mun, though you can orbit mun) You can cut down the weight a bit from this version to boost performance (nosecones, rcs, a couple winglets) I have not successfully landed it yet.