Do you need shelving? are you going to stock vases, sundries etc. Some of my vases are 3 foot tall and the only safe place is in the window. I have adjustable shelving, albeit twenty years old and in need of replacement, but if I alter it to suit the taller items I end up with a lot of wasted space. Another problem..at times I can have upwards of fifty buckets of flower in the shop which means getting to anything on the shelves requires very long arms or moving stuff out of the way. Anything on the lower shelves is hidden by the flowers.