your orbital tug is very cool
I search something to eject a little space station from earth orbit.
RCS mounted in 3 pods (left, right, aft) total 16 thrustersThrust rating 1.0 kN per thruster
Where do you want to send this station? To what Dv?
If you want, I can make a simple mesh and config for you.
If you really want to shove this thing around at 20 m/s/s acceleration, then you need at least a 1.3 Meganewton (1,300,000 newton) rocket engine. easily accomplishable with today's technologies. SSME is 1.8 MN. The big question, is how fast do you want to accelerate the station by? A typical LEO-escape burn requires around 3.22 km/s so assuming that's what you want to do, you need 74,489.957 Kilograms of fuel for a burn lasting 241.625 seconds.