Looks very nice Daniel, well done. With the hologram, might be worth experimenting with some of the ideas here

http://www.gamestencils.com/index.php?crn=224&rn=528&action=show_detail

http://www.pinbits.com/index.php?main_page=product_info&cPath=13_6&products_id=474&zenid=1ouem73kho9hd0uc5dmb1qbva3

Like your hologram, mine looked perfectly green outside of the game but bluey green in the game. I have had improved results with the green mirror, but need to muck about a bit more with the setup