This seems like something which hopefully would not be too difficult to design (there were I believe about 6-8 different three point hitch designs, from the first Ford tractors up until later, when things became more standardized I think in the mid 70's or so) and which could greatly improve the usability of a LifeTrac tractor. Although it does not directly fit the design goal of building it all for yourself from scratch, it would seem to be a high reward thing to take into account because in many cases you can find some well used but still working piece of farming hardware for cheap because it is not a 'universal' three point hitch but instead was designed for one manufacturer's line of equipment... They were designed to be incompatible with each other intentionally so if you bought a Ford tractor you would only buy a Ford sickle bar mower for instance. Sometimes things like different rotation directions or speeds were used for power takeoffs, I am not directly familiar with any of the quirks of this machinery, I just know there are different standards from having originally searched for websites suggesting how to buy a good cheap used tractor - http://homestead.org/NeilShelton/UsedTractor/HowtoBuyaVeryUsedTractor.htm - only to come to the conclusion that even the oldest cheapest and most used tractors will cost alot more than a LifeTrac and would still not be reliable or cheap to service/maintain/keep tires on/etc.

However...

Attachments are another matter. :) I've seen some of the stuff go for cheaper than I think you could build it, and certainly less work if you lack the energy to build a new machine every time you need to do some job.

Do others think this would be worth supporting? I'm willing to do more research into this myself and post it, just seeing if anyone else is willing to share in the load because it wont happen instantly/i'm very busy RL due to poverty and disability.