Any good engineering company should be able to make that from a printout.
One thing I would mention is tolerancing. It looks like you're sticking flat optics in the holes- tolerance your optics as +0.0/-0.1mm and the metal holes as +0.1/-0.0mm (for example). That way when you pot your optics in they'll definately fit without chipping. Usualy holes will be made to bottom tolerance and diameters to top tolerance so if you had +/-0.1 on both there's a good risk of chipping the optics.
Oh.. have you thought of black anodising it? (I take it that it's aluminium). This can greatly cut down on stray reflections and consequently reduce glare and increase contrast.