Housing Interior Size Upgrade

[Jojoya]

I had thoughts on that - "technically" if you make a small a large - I assume your item budget increases accordingly...thus your item limit also increases.
However aside from the exterior - what becomes of a large? Will you be able to "upgrade" those? Or is the exterior considered worth the extra gil expediture? who knows.

I still stand by my suspicion that that the size increase inside will be considered "item limit increase"*

*Unless you own a large.

The Live Letter was very specific. It was referring to the interior space and not the item limit.