Yes, that is indeed the turbojet in the middle, it doesn't damage anything even at full thrust I have a version that uses aerospikes for vacuum VTOL. I tested it for it's SSTO capabilities because of the increased weight, and it ends up in orbit with a fair bit of fuel left. Around 560 units of fuel. Using the VTOL engines in a vacuum is indeed viable. The original placing of the jet VTOL engines run directly through the center of mass. Therefore any changes, like changing engines or adding pods on these attachment points makes it easy because it doesn't shift the center of mass. For testing purposes, I've enabled infinite fuel to get into a Munar orbit. You can use either the LV-909 engines, or the aerospike engines. Either one runs through the center of mass, the only difference is where you choose the control to be from. The docking port on the top is directly in line with the VTOL aerospikes. Because there is no air in space to affect the lift and balance of the wings, the ship can be controlled from the docking port and the plane controlled exactly like a standard lunar lander. It balances perfectly for a descent and lands comfortably. My conclusion is that gimballing engines are not important for this ship because of it's small size and the torque that enables it to change pitch and yaw quickly in a vacuum. You can make these simple changes yourself, or if you would like, I'll upload my version by request.