Beautiful
That will be HEAVY when its done
the floor tiles are too small (25x25mm)
Talk to Hirst and tell them what you're doing with their molds. 2 years ago at GenCon, one of our crew showed up with a pitch using Hirst molds and dental resin. WAY to HEAVY to be really portable but cool looking tiles.
Anyway, he worked with Hirst and they made him a custom set of molds the correct size of the BB squares. If they did it before, they can do it again. They probably already have their tooling set up and just need to make a few for you.