I really wish there was mod like this, that didn't have interior spaces that are larger than the external foot print. Meaning if the outside of the factory is 20x20, the interior would be 20x20.

I really like the idea of having covered structures that you walk into and enter a distinct space, but dislike that you somehow magically get more space.

Factorio has always felt slightly off in that all of the machinery and structures in the game sit outside in the elements, and there are no actual buildings.

Are there any mods similar to this that add interior spaces that have 1:1 sized interior space?

I rly love Factorissimo but i think its OP and would prefer smaller interiors too, maybe you can achive that with modsettings where we can define how much space you have compared to the building itself?