Used a 1 3/8" step bit to make the holes for my flood and drain fittings. Looking good… Well, I know I need to wash the tub but shhhhh 
Now i’m working on my power distribution panel for the cab.
Features will include:
- Sonoff Pow - Monitor the whole cabs power usage. Fans and all.
- Sonoff TH16 - Temperature and humidity Sensor. (Switch optional, probably won’t be used yet. Not sure)
- Sonoff TH16 - Temperature probe that claims to be waterproof for res temp monitoring. If I can find a compact chiller this sensor will control it.
- Sonoff 4CH Pro Rev 2 - The workhorse of the whole setup. I plan to control the Lights, Pump, and will have two optional outlets to use for God knows what.