New Greenhouse, what are some must haves?

My wife and I are building a greenhouse - she likes gardening and plants, I'm an automation engineer so we decided to combine our abilities to make an automated hydroponic system.

The greenhouse is 10x20 and 9' tall in the middle (for tomatoes to have room)

I plan on doing an NFT system, I will automate the nutrient dosing with peristaltic pumps and EC measurements, PH will also be automated and fan is temperature controlled. Windows will open and close with the wax filled automatic window openers.

What are some things you guys have in your greenhouses/hydroponic systems that you can't live without? The only thing I can think of (and am putting in) are some shelves.