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I agree with Jason
https://www.stationroadsteam.com/2-inch-scale-fowler-a7-agricultural-engine-stock-code-10044/ Just had a look to see if Station Road Steam happened to have a set or part set of the MJ castings among their "Project" stock, as such things do turn up there. No luck, but this nice example of a finished engine might be a spur to deciding on a prototype! Dave
It would certainly be worth getting the drawings and build book before you order any castings/materials as some items are quite easy to fabricate or cut from solid so you may as well source material locally rather than pay postage and some it the items listed are just slices of barstock or simple "round" castings anyway