Here is a picture of the original design with PVC enclosure......quickly ditched that idea for the ground blind in closure. The big buddy heater was not gonna be overly effective with the PVC enclosure.
We use the 12 gallon totes like the one pictured. Lined with two contractor bags it is perfect. The seat height is right at the tote height so you don't have to worry about spraying the underside of the structure following chili night.
We will scoop ashes from the fire pit and put in the toilet occasionally to keep the nastiness covered and smell down.
Also.....way to may folks with shallow pits for crapper use. To be quite honest....it is nasty and you all are so dirty mother lovers...

!! There is a spot in the Entiat that has multiple sites that were clearly dug for crappers. It is disgusting knowing folks are putting their tents / campers 5-20 feet away from holes full of crap. You know dogs are digging it up too..... Don't be lazy, pack it out and dispose of it properly.