These look beautiful!
Maybe the remaining big names in photography are mainly concerned with large volume manufacture and sales...but there's still lots of scope for much smaller independent producers, as with some of the glass plate makers.
Anyway, I'm just going to peel a few potatoes and have a think...
It's reminded me that I have a couple of colour glass plates, from a Flea Market in Amsterdam years ago...not autochromes, but lovely regardless! I'll scan them next time they re-surface.