Slant six intake manifold flanges, anyone got a cad file?

Im looking at building a custom three carb manfold for a 225. A mate of mine works at a place that can do wate jer cutting of the aluminuim for the flanges. Ive got gaskets for the carbs. But I don't have a spare manifold to copy the flanges off. (Its still on a running car)
They charge $100 to fire up The machine. (My mate is going to.try get a better deal) So it makes good sence to.get both lots of flanges done in one hit.

Does anyone have a cad file for the flanges? I could just buy a ready to go manifold. But theyre like $500. Im pretty sure i can build for half that