I like what you have done. i have an electric kettle (not an entire brewery) i have thought of adding temp controls, automation etc, but so far since i do small batches in a 4gallon kettle i have only needed a 1500 watt element. i don't even need any pwm, ssr, temp control etc. only control is the plug. it boils well but not so vigorous that i need to limit it. when i first built it i had spent a lot of time planning the electronics, now i am not sure i will add any.