I would NEVER scale anything up in Model
If a door is 36" wide in real life, it should ALWAYS be 36" in Model
If you scale anything up in Model, it should be the title block ONLY if you are going in that direction.
I just realized, there is one case where I do put a title block in Model
I have macros in work that we use to insert the title blocks into paperspace in our drawings
The source title block (blocked in drawing) needs to have the title block in Model Space as Paper space can not be blocked in.
Still, My title blocks are the actual and proper sizes (ie 17X22, 24X36) and so on