The 3-D printers which are relatively new to the market are fabulous for certain 'tasks', but not the right 'tool' for this job. Overall, the 3-D printer process is quite remarkable but I think the price per unit would be more than anyone is willing to pay for a repro.
There has been a lot of talk about what 3-D printers are capable of doing and not a whole lot of discussion as to the cost per unit which can be an real eye opener. 'Old' technologies like metal laser-cutting and or sand castings techniques are still the most appropriate 'tools' for this project.
I still think an aluminum casting is the best approach.
