Maybe I shouldn't say nursery. But I'm looking for advice or pictures and layouts for something that can house a few thousand 4" potting containers.

I'm starting to clone and grow ground covers because they seem to be very popular and I'd like to sell them to make a couple bucks. I have a career already so this is more of hobby.

I was thinking of basically building a few sunken garden beds. Long so there is a few rows that can handle 2 thousand containers.

BUT, since I'm doing containers, is there something better to build or create that can house these plants?