This is a modular blackout kit that I've created to help you build and prototype quickly game and level design. The kit is exported as FBX and can be used in any 3D software. There are also some textures that will help you measure your texture density. You can learn more about the kit and its use here:
https://www.youtube.com/watch?v=e50wIYx5SPI&t
or here:
https://www.youtube.com/watch?v=2ucwT7keRcY&t
Good luck with your projects!