Nice! Your craft even looks good! I am also trying to build a vertical takeoff SSTO. My design is similar to yours, but I am barely not getting into orbit. What is your flight plan? I think my rocket has the right design, but I am ascending inefficiently. My flight plan (that doesn't work): 1. Climb vertically till an alt of 10km 2. Angle to 45 at a heading of 90 until an alt of 15km 3. Angle to 15 until I get close to running out of intake air and reach about 1100m/s at an alt of about 21km 4. Turn on rockets and turn off jets and intakes and point nose at a 45 5. Turn off aerospikes when my apsis reaches 75km but continue using nuclear 6. Run out of fuel at about 2000m/s... My craft: 51 tons 6 turbojets 3 aerospikes 2 nuclear engines