Question about UV modular buildings

Easton

How would I make a building modular? From what I understand I would build the entire building, then take certain objects out of it like doors by detaching them and moving them away, taking said doors and unwrapping them then rendering out the UV and exporting the doors to texture them, this way it would be modular and you could add details to the doors that you otherwise couldn't as a whole building right?

Then I think moving those doors into a game engine and placing them inside of the building that they were created for.\

I am not sure if there is a better way to do this

Deforges

Here is a good resource for you to look at.

poopipe

That's a bit old but the principles seem sound.. 

The main things I'd change for ue4 are... 
work in metric units rather than powers of 2
Use fbx because its good