Well I’ve sent out .STP files of assembled engines and others have made from that one file using CNC on the parts that suit it and more traditional methods for other parts, just need to start charging for it now.
I’ve also bought plans supplied as pdf files but it may have saved a bit of work if they were something that could be opened in any CAD program.
More likely you will buy a “casting” set with the “castings” part machined on a CNC for you to complete, Stuarts already do that and there are quite a few kits about where you get laser or waterjet cut items.
I wonder what Mortons would pay me if the “drawings” for my next engine build were just a QR code rather than 5 or 6 pages?