Stop in for a cup of coffee
Prob if it will support decent 3/4 end mills definitely will do a half. You have to get a lot of cores to pay for it to make money back. I have seen some used not working number boxes go for a few bucks also. Definitely a nitch market. Doubt it will pay to tool up to do it though. Steve has a Machine prob work out for him if he wants to get into it. Figure it this way good ecu 25-40 each, wiring 10 at the best with the right plugs. Weld on studs for the ecu mounting and the spot gun also prob a dollar each. Then you want to make at least a cover of some sort for the bottom to keep water out and perforated to let air flow? Say $5 each and then the core. You can get a rubber stamp made with the part numbers and use machinist ink and paint cheap cases also say at 15 each case if they are still that cheap.