I have been playing around with the idea of etching pictures and etching PCBs. I also wanted to have a vat that protected the main mirror while not being a vat filled with resin or keeping around a used vat. So I drew up a vat and printed it out on my ROBO 3D. It isn't perfect but it will do. I used .093" Polycarbonate for the window. I used some SUN ART Paper to "etch" my first picture. I think it came out great. Not very exciting but it is accurate. I think my vat was pushed a tad too far back. Now it's time to buy some PCBs and spend some more time with OpenFL's API!
Link to the vat file on Pinshape: Form 1+ Etching Vat