Nice!
Good job....you'll just have to monitor temps and rain infiltration to see if the tarp needs to be adjusted.
With coops and chickens (and anything in life) no matter how well planned, there are almost always adjustments.
Have Fun!
Link worked for me.......if these are within your budget they are an excellent choice.
I agree wholeheartedly to use screws for 'adjustability' and accuracy.<thumbsup>