Has anyone tried a sheet of high-pressure plastic laminate as a varroa
floor?  (Common brands in  the US are Formica and Wilsonart.  It is used
over a substrate for kitchen and bath countertops.)  This stuff is about a
tenth to a sixteenth of an inch thick, and could be slipped in from the
front without modifying the bottom board.  Fancier rigs, with drawers
opening to the rear or screen covers, could be made easily.  The sheets
could be sprayed with cooking oil to make them sticky, and could be reused
just about forever.
 
I haven't tried this, but it seems like plastic laminate would be cheap,
easy to use by inexperienced people, and require no modification to the hive
unless additional features were desired.  Any thoughts?