WE HAVE STANDARD FIBER GLASS TUBS. WE ARE RESEARCHING THE IDEA OF HAVING A CENTER PORTION OF THE TUB CUT OUT FOR EASIER ENTRY FOR OLDER ADULTS. ONE STIPULATION WE WOULD LIKE IS THAT WE COULD SEAL THAT CUT OUT PORTION WITH A DOOR IF THE INDIVIDUAL WANTED TO TAKE A BATH AT SOME POINT, OR NEW RENTERS DID NOT LIKE THE CUT OUT SO TO SPEAK. NOT SURE IF THIS EXISTS AND IF IT DOES WHERE AND COSTS? ANY HELP OR DIRECTION WOULD BE APPRECIATED. THANK YOU