I have just finish building my Orchidarium. It is scratch built from acrylic sheets that is fused together with disolved acrylic (solvent dichloromethane). The lightbox on top is made of MDF board and I use four 54W T5 lights with refectors. The front of the lightbox is attached with hinges and can be swing open for easy access seen in the pictureto the left.
The false bottom is equiped with a fan blowing air over a water tray to humidifie the air. I have some worries of the temperature and humidity in the orchidarium but the future will tell if I have to adjust the construction.
/Magnus