The bed will be a 1-piece plastic part with the racks molded right into the bottom. We haven't finalized materials yet, but there's a good chance it will be acetal for its wear properties. However, you won't be printing directly onto the molded surface. We've been using the standard blue painters tape for most of our printing - it's cheap, easy to apply, protects the build table surface, and lasts for several prints. We'll be looking into other types of removable adhesive tapes, though, to see if there is anything better.