Autometer Cobalt Duster cluster conversion

There's a place in town I'm hoping will be able to help me take a 3d scan of the plastic housing then print (3d) an altered version it (smooth face). That way, I don't destroy the original and I can cut holes to fit whatever gauges/layout I want.

I'd like to keep the rectangular speedo for nostalgic sake of the car, but it doesn't work, I can't find a replacement (or even a decent aftermarket square one), and the mph doesn't go high enough. :p