In our greenhouse the sunniest side is a low, raised bed, whilst the center and less sunny side is paved with staging along the side.

chicken wire the floar if you leave your chickens in there infact id keep the door shut myself . they say goats eat anything . well so do chickens lol .

i'm abit of a lazy gardener and grow everything on shelves in the greenhouse,it saves me digging the ground.have a think on what you are going to use it for growing before you make a quick decision.i have gravel on the floor with a membrane underneath.

Remember if you are going to grow tomatoes in the ground you are advised to change the soil every year. so growing in a bed saves a lot of watering but makes more effort at the year end. You choose!