That is a really cool design.
The problem is the size though. In a lot of places (my state for example) people are required to purchase at least 6 chicks so really the minimum coop needs to be able to support at least 5 or 6 full grown
chickens. That design would be great for three
chickens (or perhaps four or five bantams) or maybe two ducks.
A lot of these tractors have really cool designs but if you have ten or more chickens you really either need a stationary coop or an actual
tractor to pull your mega
chicken tractor. I tried building one for the ducks one time and by the time I got it stable to last a season with our sometimes rough terrain it was too heavy to move by myself. Now it has been converted into a lean to.