Modular Military Buildings From Damocles Kickstarter Part 1

You can have 10000 compatible files including this set for 40$ here.
https://www.myminifactory.com/campaigns/damocles-part-1-modular-industri...

This set include files to make:
4 tanks in different versions (tank or transport).
3 Types of modular building (barrack, bunker, watch tower)

Download the free manual here 
https://drive.google.com/drive/folders/1Di20CerHtJwRTODCx9YC-K0VKAJ1sw_u...

More free doors variations here:
https://www.thingiverse.com/thing:3681998