I don't think anyone's done it because it would just eat up so much floor space.
Most people put a sofa or love seat against a wall, right?
Might make a great outdoor piece of furniture though.
Best idea yet...........mount it on the outside wall, hang it outside the wall like a bay window (or green house window). Just cut a hole in the wall, blocking all around, and a good sized header. Hire a structural engineer before cutting.
Best feature, because it does not require a foundation, so a building permit may not be required.
Yes, I have had a half glass of wine, still a great idea.