Very nice setup.....i built a similar setup several years back......here is a couple pics....
I really like your dog bowl setup mounted on the door....i'll have to get ahold of TNT for some of those.....
My dogs would chew the heck out of those plastic water bowls, though.....
I hope your septic system ends up working out better than mine.....I just never could keep the in ground pipe clean of debris....pine needles mostly, but everything seems to get into that waste pit.....i ended up capping off my system, and simply digging a big hole to wash all the waste into....I works much better, and you only have to dig it out 2 times a year.....