Fronteris style bunker

A bunker, or perhaps a secure stairwell, in a style harmonius with Sector Fronteris (and a bit of Sector Mechanicus).

### Compatibility

It is the same height as a Sector Fronteris hab unit.

Otherwise, not really! It's standalone scenery. There's no pipes. I have tried attaching the stockade walls to it, but I didn't match the pillars _quite_ that closely. It wouldn't take _much_ effort to make them fit, but the effort would definitely be there.

### Pieces required

You will want:
* 1x front wall
* 1x side wall
* 1x side wall **MIRRORED** in your slicer
It should be fairly clear which way around they go, but I've provided all variants for the right side (when looking at the door)
* 1x pillar A + 1x pillar B
Aside from the bolts, these are mirror images of each other. I've provided them like this because they aren't overly obvious if they're the wrong way around, unlike the side walls
* 1x rear block
* 1x flat roof
* 1x sloped roof
* 1x door wheel
* _Optional: 1x sign_

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