When advanced radar comes along, I sometimes build it next to the initial one, and tear down the old one, replacing it with the antimatter storage and a laser battery, to give a 3 wide bottleneck directly above the living quarters. Quite often, I have a sedcond base by then, and tear down the workshops (second base is usually production focussed) and put the antimatter sotage in the space freed up by this, along with a lab or two and a second basic storage