Are you aware that Sergent has put his designs into the public domain? He has has said he will work with anyone who is dead serious about moving his work forward after he is done. So worry not.
I don't know the process that Frank uses to go from resin to metal. But FormLabs has a new wax baring resin that substitutes for the wax used in lost wax casting. ( i.e. investment casting)
The cost of SLA printers keeps coming down and detail that they capture keeps going up.
I just bought an SLA printer off Amazon yesterday for $350 US. It arrives Monday. The size is just right for my modeling needs and the detail level (which is very high) is equal to the FormLabs, Form 2 printer. I am not a maker geek by any means. But once you get the hang of 3D cad drawing. A new world of modeling possibilities opens up to you with a 3D printer.
At some point in the future, someday, SLA printers (or something better) will be as common to a modelers work bench as an X-acto knife.
The day is coming!