Fun! As a hobbyist-not-an-electrician I love these DIY projects. I'm currently trying to figure out a 12V foam cutter. I have one bed in particular I'd like to grow sunflowers and veggies. The neighbors and I have trouble with the urban deer that wander through. Nightcrawlers wreck the lawn. I'll check back..please post your progress and trail cam highlights.
Don't forget that 4yr-olds read only slightly better than deer and you might want to double check the property insurance (Intact had concerns about my turtle cage heater). Maybe a downstream water shutoff so you're not reaching?
Most important! In the interest of fairness, has your wife demanded you perform the "pee" test yet? No photos please.