You are better off splitting up the job with multiple farm bots
Also, if you expand one direction (either x or y) rather then both, you can have a rover cover 10 by 800 or so with a few small upgrades.
With an acre of land, at that size, it wouldn’t even be about “can it be big enough” but rather “how long will it take?” I can imagine the motors on the thing to farm an entire field like that would be enormous.