Rig housing front view, with DivinyCell foam PVC buoyancy compensation, which reduces and relieves hand, wrist and elbow fatigue, from struggling with the rig underwater for hours. Divinycell foam PVC does not compress at depth, so my rig maintains the same buoyancy characteristics at any depth throughout the water column. If I release the rig underwater, it practically stays in place. However, my preference is to have it slightly negative.
Note the "cross bar" which serves as a convenient handle for carrying the rig and conveying the rig to/from boats. It also serves an important function to help protect the housing itself from getting banged up. A ring of DivinyCell around the port housing adds buoyancy (affixed with 2 zip-ties, strung together).