I was worried about "north-facing windows get no direct sun", but you do seem to have a glass roof.
We added a "four season sun room" off one corner of an under-used part of our house, to help us sell it. That room immediately became our favorite part of the house, and we didn't WANT to sell it!
If our current manufactured-home-park continues assassinating healthy trees, and takes down the two huge old beautiful pines in back of the house, I may try to get a clear roof and some cheap clear walls for that back deck and have a sun room / poorly insulated greenhouse.
