As I mentioned earlier, the whole office-guest room conundrum is resolved. As you can see, we now have both a lovely guest room (our soon-to-arrive houseguests should feel reassured) and I have a very nice office. The guest room provides a useful space not only for certain ten-year-old bookworms, but all of our recording equipment and myriad instruments.
The office provides ample space for...well...whatever it is I do all day. I'm sure I'm up to something in there. I have lots of files and cables, monitors to spare, and a small headset collection. So I must be doing something useful.