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This is something some guy just threw together with a welder and some scrap material. There are no plans, and you shouldn't consider building one like it.
As an experienced off roader for over 40 years, I can tell you this rig is not a suitable off road vehicle. it is too top heavy and will flip over almost immediately on uneven surfaces or hills. Even applying the brakes too hard would make it flip forward, planting your face into the ground.
A really stupid idea.
Cruz
Sure go to http://www.youtube.com/ and put in tractor. Then email the person or ask for Blue prints.