Take a look at my shadehouse, (pc in social group Florida Orchid Lovers) just some twoxfours and shadecloth from Lowe's. (Their package cloth just fit this size ) This is 8x16 and hold 60 orchids, all hanging in the breeze, the ones needing more sun just placed them up front facing East, shade in the rear, This cloth is 70% and works great. Still plenty of room for expanding
bark chip flooring heps with humidty , and bugs. We'll cover top with plastic if needed for rainy season. There are three sides with shade cloth that can be covered over with plastic for winter. All orchids seem to be happy and doing well.