I have nothing of real value to add to this conversation, but I wanted to
say: (1) this seems like a really cool project and I look forward to
seeing how it progresses, (2) I would also love to see process photos, and
(c) I work at a science museum and we have one of the big 5' fiberglass
gravity wells, and people - of all ages - love to see their coins "circle
the drain".