I did get the station core up (messed up the orbit while preparing to do a deorbital burn and had to restart, but meh, I wanted to add a battery to the unmanned craft I was using anyway) but I don't know how I'm supposed to set up the save. Do I have to make a new save iteration or like what?
I actually tried to send up a core with a module in between and another core on the other end, but I couldn't fix the wobbling.