all the code stuff and logic is correct.
My opinion, with out rearanging the world, Perhaps too logical (and fun removing, (I do enjoy the creativity))And simplistic, relocate the LV wireing, position the controler in the garage on the existing ungrounded 2 wire ckt.
Aside from all that, how would you feel about driving the snow plow around that, or maybe even adjusting it thru a snow storm or just...... Never mind.. you bunch of fair weathered spoiled people!!!
Guess winter is getting to me!