Great looking little space, Neil. Isn't it fun to actually design the space to fit your needs rather than make do with a hodge-podge of legacy cabinets, multi-height tables and dubious light fixtures?
Although I like my sheet metal hanging wall, when I decide I can make do without it for a week, I think I'll take it down and have one side sand blasted and maybe powder coat the other side. Both options should cost about $50 each and will greatly help the glare. Finger prints, too, become a problem after a while with the raw steel.
I like your pin magnets. The only ones I found were multi-colored, so your link to Mr. Super Magnet Man is a good find. Although I'm more than happy with my little magnetic B-Bs; they win for unobtrusive cuteness!
I tried the Solux 4700K lights but decided the look was too cold for my gallery and opted for the 3500K bulbs, instead. Did you read the Solux "White paper" on bulb temperature and people's response to viewing artwork? Of course, since I have a goodly amount of north light coming into my studio, that and the warmer Solux bulbs probably average out to around 4700K...
Hope the 8300 is worth the real estate it occupies. I certainly love mine. My old Cibachrome lab is just a dim memory and that's fine by me.