I have done exactly this in the past, and it works, but I was hoping there would be a way to create a symbol or fixture of sorts that recesses into the floor flush with the finished floor, but does so dynamically and has a hinged door like a cabinet. I have been playing around with a modified cabinet and then converting to a symbol, but I lose the ability to show the hinged door at that point. I have been converting to an interior fixture. Maybe I need to use a different selection?