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I appreciate your enthusiasm. First of all, the design originates with Open Source Ecology, a sister project. I'm involved with Replimat. There's also Gridbeam, XYZ Cargo, Precious Plastic, and about a dozen other groups actively developing around the system(s).

I appreciate all your points about the sort of tractor best suited to your unique circumstances. I don't see anything about our communities designs which prevent you from constructing such a machine using our parts and techniques. I think it'd be a neat design to have among all the others which can be built this way!

For example, here is another design with it's own unique advantages and disadvantages, built using many shared components: https://wiki.opensourceecology.org/wiki/MicroTrac_v17.10

I would also note the N-series was one of the first tractors with a 3-point hitch that worked reasonably safely.