Mark, nice greenhouse!
I'm definitely no expert on the subject, and in fact I just got around to putting one in this spring (after giving the possibility nothing more than lip service for several years, lol), so I also have a lot to learn on how to make the most effective use of my greenhouse.
Compact and dwarf plants are a good choice, especially for those areas where there is shelving in place. I'd encourage you to look at some of mdvpc's pictures of his winter dwarves he's posted in the past (do a search on this subforum for his posts) for some ideas and insight as to his setup.
Lettuces and greens are something else to consider for your fall and winter greenhouse growing, especially since they will take a little cold.
Hopefully others will chime in with more ideas, and some answers to your heating questions.
