Attached is a photo of a free-standing unit I build many moons ago. Sump and pump are below. The support is black ABS plastic - solid sides and back. with a perforated support. All inside of a polyurethaned wooden cabinet.
The support is perforated as I was drawing air through the EcoWeb mat with a fan. It humidified the room and purified the air courtesy of microbes living in the rhizosphere.