Still. You need about 1000 8 inch cmu at $2 each, a mixerload of 10 yards concrete, a few hundred feet of pex line and a bit of 4 inch pvc, plus a toilet on th

Still. You need about 1000 8 inch cmu at $2 each, a mixerload of 10 yards concrete, a few hundred feet of pex line and a bit of 4 inch pvc, plus a toilet on the next indestructible prison toilet order. I could build that for under 100k easy and it would be nearly indestructible and easily cleaned, I know because I've done something similar; the materials cost is at best 20k and could be built mostly by unskilled homeless in need of jobs rather than some weird engineered design that demands skilled tradesman.