Hi M4rkle, thanks for your recent edits in this area. Just a couple of thoughts about https://www.openstreetmap.org/way/323111404

You don't need to add building=bunker because there's already abandoned:building=bunker. This uses the lifecycle prefix (https://wiki.openstreetmap.org/wiki/Lifecycle_prefix) to indicate that the bunker isn't currently in use.

I clearly had a brain fart with bunker_type=gun_emplacement, would you agree that bunker_type=pillbox is more appropriate?

All the best,
Matt