Would you not be better off with a flatbed UV Andrew?
I used to have one and we printed quite a bit of sheet metal through it. Obviously resolution is the key which I think would be pretty much spot on by now...
USING: Whatever it takes to get the job done...
I had planned on one of the big flat bed UV's for the past few years but never taken the plunge. Think that ship has sailed for me now on the level of investment needed as I don't plan on a much longer stay in the printing game. Certainly will be one of my regrets not having bought one when we had the opportunity.