Oh....trust me, @TJordan ...my roost bar/poop tray is picture perfect. And yes, I am using a 2x4 laying flat, even had my BIL soften the edges by routing slightly and sanding them! Roost bar is removable for cleaning/replacing, sits approx. 14" above the poop tray which is lined in Sweet PDZ...love that stuff! I have a custom-built ladder going up to the tray, slats are no more than 6-8" apart...(my camera is on the fritz or I'd post a pic) but here's the pic that I fashioned mine from:
Please note that I did NOT do what they did with the roosting bar itself. They used what looks like a 2x3 (or 2x2), but mine is a 2 x 4 laying flat. I was really pleased that I, a 70-year-old single gal was able to reproduce that setup and built it myself (pats herself on the back). What I did was to extend the four corner posts up to roost-bar-height and put a cross piece on each end, then hung one of those metal hanger thingies on each end so I could just slip the 2x4 in it....pretty dang proud of myself!