I reguarley pee around all my shooting houses. The theory is that if they smell it all the time, then it's just ignored. At least that's what my BIL told me.At one time, I had a funnel inside with surgical tubing connected to it, run through a hole in floor, attached to one of the legs and buried in the ground.
"Redneck septic system " so to speak.
But now, just open the door and step out for a stretch-pee. They say the scent molecules in urine break down in 8-10 minutes.