Ya'll need to get in a library. The false floor "burrow" idea goes way back to some books from the 80's as a method to expand the overall usable space in an enclosure particularly with larger snakes/lizards. Most everything in those books is BS now but that idea was always a good one.

Cool idea to expand the space available in the tubs. I've never been a big fan of tubs for anything but babies just because I like to decorate enclosures and see my snakes but this is neat. It would be really cool if someone would manufacture a tub that is actually see through and not cloudy.