If I was to design a prototype tractor I would design it to be maneuverable and compact in tight spaces while being gentle on the turf ie. no skid steering. I would also make it easy to work on and repair when needed.
Hope this helps I did not exactly know what you were getting at.
i can see that design selling it looks small and could get into alot of tight places. better tires would be great but good smoothe tires would also be a plus for people doing landscapeing.with all the guys going around doing lawncare i could see this thing being used alot. you could make different attachments for it maybe even a hydraulic mower deck it could a a all in one zero turn piece of equipment. you could cut grass in ditchs while staying on level ground. also depending on how long of a arm you have on it you could make a saw attachment to trim tree branches.the potential is endless with this design.