That greenhouse is far too pretty to put anything in it that will get it dirty.
Regardless of the shade cloth, unless you have a swamp cooler or AC, your greenhouse will probably be far too hot in the late spring and summer to grow much. That is unless you have a great source of shade (trees) that blocks the sun during the heat of the day. I have two greenhouses and even with all vents and doors open, 80% shade cloth, and four fans running, they still get 110-120F during the summer months. The only thing I do with my greenhouses in the late spring and summer is start vegetable or other seeds and root plumeria. I don't grow cacti, but they would do fine.
