Project Help (paid): Stud Welder (upto 200v, 460a discharge)

[OceanHydroAU]

I'm looking to commission someone to design for me something like an "Arduino spot welder", except for joining screw studs to metal sheet. using a holder like this.

It can be powered by 18650 cells (I have hundreds) or capacitors (price depending).

I'm after only the power electronics; I can handle the "brain" stuff (Arduino MCU controller).

My goal is to open-source the results, to share globally for free.