They are too close together for my liking as well, but with over 1500 pieces of glass to accommodate, and only a couple od very safe cupboards to keep them in, there is little choice, and I felt it was better than keeping them in boxes!
From memory, the tallest ribbon one is about 16" / 17 " and is one of his later ones... but as you know there are no dates on them.
She has survived because we drove to Devon to collect her as we did with the tall dark one, driving to Cornwall to collect.
Most have been collected, or entrusted to friends like Chris Cooper to post for me as he is so thorough and careful or I use Mail Boxes, a very good pick up, pack and post service.
How do you get yours Chris, do you collect them, and may we see your collection?