Just ran my practiced surveyors eye over the pics posted to date, & may have detected a serious planning flaw.
I can not see an appropriate peeing rock.
If I was you, I would blame the project manager !
I found a rock.
I'm going to crack into a 6 pack later and do some testing, see if it will work.
I've got some High Life brews and could help you come test after dark. That rock looks a bit flat to be peeing on but from that elevation, it should work just fine.