Clockwork13, you mean my solid ring station? Well, actually it was quite easy to put it into orbit - in two pieces. 1st piece was the hughe ring with central 'hub'. It required a heavy two-staged booster: 1st stage = 7 orange fuel tanks + 7 Rockomax Mainsail, 2nd stage = 7 orange fuel tanks + 7 Rockomax Skipper (the higher ISP is here the key! ). With this booster you easily get the ring into a 100 km orbit. The second piece was much lighter and used a smaller booster. The big tug was only used to move the pieces into a 250 km orbit.