I'm sorry but that launcher is clearly inspired from the rocket used in the demonstration.
Also, your launcher is surprisingly performing. I recreated it, this is what I ended with:
We have a similar quantity of fuel in LEO, but I'm only at 7338 m/s instead of your 8466 m/s. You blow up my performance by more than 1000 m/s... Is there something special you did to explain this?