Stormcrow has (as always) great feedback here. I just wanted to add a few thoughts to that list:
Your description says 4 roosting bars, but the drawing shows three. The bar closest to the wall looks too close: should be a foot out to avoid birds pooping down the wall and a foot spacing between bars. Even with 3 bars, you'd be left with only a 2-foot wide walkway. I would nix one bar. For the number of chickens you plan on getting, two 6' bars are MORE than enough.
This area looks to be about 1'x5' in your drawing. That's a bit narrow. Could you make it 2 feet wide, leaving your roosting bars 5' long? That would give you 10 feet of roosting space with the 2 bars I suggested. That's still plenty of room for your birds to roost and gives more elbow room all around.
Cache Valley gets its fair share of rain/snow. Those tube feeders will only work if they are under cover and protected from ANY AND ALL precipitation. Otherwise you'll find yourself cleaning mucky wet slop out of those feeders. If you plan on putting the tube feeder under a wide awning type of cover, that would probably work. I'm in the Ozarks and we get a lot of rain here too. I got a large old table at a flea market, put it in my run, and placed my feeders on a brick platform under the table. Except for the rare sideways rain, the table completely protects the feeders from getting wet. You also don't want to make the mistake I made when I first started: putting feeders inside your coop. That just invites unwanted critters into the coop.