Now that I know a simple way to create textured models I see the game growing visually. I made a lot of work on the gameplay, but the visual feedback was missing. That's like a building rising from it's blueprints. Quite impressive and deep feeling, I have to keep calm and move forward.
Here are some models I made :
Refinery place holder
Warehouse place holder
Research Center place holder
You may recognize common forms as I only made 4 different textured "base blocs"! That's good enough for place holders.