Main points:
The wall under the turret is placed BEFORE the ramp (showed in the video what will happen if you do the opposite).
You can place a battery instead of any locker.
I strongly recommend you place a double armored door at the entrance to the main core, as the door protection of the base sucks.
To guarantee the placement of the vending machine bunker, place them first, and only then the door frame.
To avoid the hassle with the embrasures, place them before the ceilings (don't be me).