If you would wish to cheat a little (as trophies are decorative items I think it would do your job):You could use a standard ABS/PLA printer, and use one or more of the metal infused filament's for printing. I have seen very good results, though some finish polishing is needed.If you go this route, you will be able to use a printer that has multiple extruders, thus allowing you to switch filaments being used in mid print, and making different metal appearances easy.I do not know about what is available for the size you need though, most of the ones I have looked into are for smaller work (the one I am building is going to be limited to 10 inches high by 8 inches wide by 20 inches long). I would also expect that speed would be a concern, so that would likely up the cost as well. For a ABS/PLA extrusion printer that would fit your needs (speed, and size), I am thinking you are looking at around $5000 for a premade unit.