Sorry do not like this concept.
It is not about your modelling job, this is GREAT!,
But, this factory looks not "big" enough for building tanks inside of it.
It has the Military "feel", like fisk0 wrote, but NOT the factory "feel", as it should.
You have to keep in mind, what "function" the building has, which you are designing.
For factory, it should have enough space inside for :
- materials
- workers / factory-robots
- the stuff which is to be builded (tanks, trucks, etc)
At least you have understood the "simple logic" principle
Use google search for reference pictures, start with "tank" "factory", etc. you will find many reference-material.
What I want to say is, factories are "big" and "simple" Buildings with much space inside:
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