height which I can build greenhouse

[euan]

hi there, I am very new to this and have a question, I am an architectural student and am designing a building which houses hydroponic tomatoes. I just want to know what the minimum height at which I can build my greenhouse would be or is that a how long is a piece of string question? is it really just case of how many tomatoes I want to grow will depend on the size of greenhouse??

thanks: euan