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Seen from above, ten metres a square. Point at a piece to name it, or press a line in the manifest to find every one of them. Gold is the FOB, red the stationary defences, green the support kit, blue the vehicles.
TBH if you're building a little single-use FOB like this, consider just dismantling the outer wall to enter / leave rather than including a door at all. Not like anyone else needs to get in.