I recently came across an interesting sample material for flooring. Its basically a tongue and groove plywood laminated on both sides with plastic /UHMW like material (technically it is high density polymer ethylene). It is made by Viking ice (http://www.vikingice.com/index.html) and it is used for skating. It lists on the site that it can be adapted for trade shows, and dancing , but It seems like it could be useful for more than just that. Like, for instance, it seems like it would be good for automation, and possible rigging applications as well. It comes in 4' squares, and grooves together with a plastic tongue.
I do wonder what they use to glue the laminate together because for tracks and such for theatrical purposes, flexibility in size would be a requirement.