The Maya man is right. The method of propulsion is an issue as cables would not be effective. I saw a doco on some British dudes c/o James May where they were using high intensity lasers to 'push' a UFO so to speak to gain height. The laser pulsed underneath the UFO and somehow created lift, it was part of a comp into this elevator theory.
Once in orbit off you go. I believe they were thinking of mining helium3 from the moon for the fuel steve? I cant remember. This fuel theoretacally could power any ship and as you said, no gravity to escape from. The days of blasting components using standard hydrocarbons would be over.
https://en.wikipedia.org/wiki/Escape_velocity
The above might explain some things. If the laser thing didnt work there was another 'rail' system proposed from memory, much the same way a roller coaster starts off on its journey. The loading would be a problem, so you have power of unit/weight/propulsion issues which need to be resolved. It is quite a feasible idea. I would think also the 'dock' would need some good processing to keep it in orbit? as even geostationary object orbit decay over time, so it would have to be constantly adjusting for this. Of course the propulsion method would have to be strong but flexible enough for this as well.
cheers bullet
I will do a sketch today and throw it up g-man
bullet1968
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes