Hi @FlippyNips The sonoff schedules are stored on the devices and they also have a wake state so if power goes off when it comes back on it just carries on from where it was.
Re shed wifi I had the same issue but daisy chained some of these, https://www.amazon.co.uk/gp/product/B00KRDIEBW/ I get full blown wifi in my shed which is a way from the house
I use a TH16 to switch a humidifier and a Handy Heater, based on max min temps and RH%age range
it works a dream, if you want to switch your lights, depending on the ballast or driver you may be better buying a sonoff S20 switchable plug and running a contactor off it. I use one to run a 2KW heater on a timer to half keep my shed warm during the beautiful winter months
@Colanoscopy I love your build mate, and well impressed with the pixels pics, shame the phone is so expensive