I was under the impression that tractor manufacturing was down to bolting together bought in components at this point, such as the various Turkish Perkins engine + ZF gearbox + Carrero front axle + random cab companies cab, with a bit of fabrication to make parts to hold it together. A coop building a highly repairable tractor could make this their value proposition by publishing the diagrams for the fabricated parts, and the full list of parts they bought. There's little reason that a fairly normal fabrication shop couldn't be making tractors, and making them competitively with mainline manufacturers