Very cool. I really like the snowblower attachment.
This isn't my first electric mower, I've done something very similar in the past too.
But I don't like how the speed sags lower and lower as you go. I designed this mower so you get 100% power until the batteries are totally drained. And with lithium you need to be very careful to not over-discharge, with a controller it's idiot-proof. Just set your minimum voltage in the controller and drive it till the power starts cutting back, time to go swap the pack and do it again.