The cute hardware store rider mowers are ok. My neighbors contracted a service with ZTR mowers with automotive sized engines in them. Airplanes make less blade noise.
Rooftop ideas usually are missing something. There is no room inside the house for great ideas because it is full of caskets that won’t be used for another 60 years and cremated remains fit in a shoebox.
$100 in pennies is about 60lb. Get out the kitchen scales.