I've followed this thread out of interest from the utilisation of space aspect.
I personally don't have a home office as working from home is not an option in my line of work.
I do have a little man cave though, 7' square and kitted out with cheap IKEA stuff, I guess it's cluttered by all of your office standards but this is purely leisure & 1hr max/day.
I certainly wouldn't want to be working/confined here