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I made the run six foot by eight foot, same size exactly as the coop. This made the job simple, as I could use 8' long 2x4's, except for the two running on the angle of the roof, in which case I used ten foot 2x4's, with a tad cut off. Being six foot wide I could use the coop as the back wall, to fasten things to. ( You don't need the mesh screening at this wall either) The plastic roof panels come 26" wide by 8' long. This allows for some overlap on each panel to prevent leaking, so three panels did the trick to cover the six foot width. As the roof is at an angle it is slightly longer than eight feet, so I cut an additional roof panel in three sections to use across the top to fill in the gap.
If someone was to use this plan, they could plan it to allow for just using the three eight foot panels to cover the roof, but would have to shorten the length of the run by about a foot. I should have realized that the angle would make things a tad longer at the roof line to begin with, and I could have saved the price of one roof panel.
I suppose a person could simply use a piece of scrap plywood to fill in the gap. The plastic panels cost around $18 CND each.
Forty feet of four foot wide hardware cloth was needed for the run, plus an additional thirty feet of the two foot wide hardware cloth to go completely around the coop, as mentioned, buried one foot. The hardware cloth extends across the roof, under the plastic, which gives it additional support, as well as making it predator proof. The angle at the roof line, allows one to cut the upper side panel mesh, which leaves you with a mirror image for fastening to the opposite side.
I placed sections of beveled cedar siding around the bottom of the run, as a splash board for the rainy days, to help keep the run dry. As well it blocks the wind a bit to stop the shavings from blowing around, and keeps the birds a tad more comfortable.
The dropping board has a formica top, for easy cleaning, although some linoleum would work as well. Most of the droppings fall into the shavings which I simply scoop up every morning, and add shavings as needed.
Building materials for run. (keep in mind the back wall is fastened to the hen house, so no screen used there)
4- 26"x8' corogated plastic roof panels
7- 6' 2x4's
2- 10' 2x4's
4- 8' 2x4's
1- 6' 4x4 (cut in half these are used for the upright supports at the low end of the roof)
4- ripple strips to fasten roofing to, it gives additional support to the plastic.
3- 8' 2x2's for run door
4- 6' 10" wide beveled cedar siding
2- hinges
1- padlock hasp
1lb- fence staples
1 lb- 3-1/2" outdoor screws (easier to fix mistakes then using nails

)
40- 1-1/2'roofing screws (they have a rubber washer to prevent leaking)
4- bricks- to rest upright supports on at mid point, and lower end of roof. (I put a bit of duroid roofing over the bricks to stop water wicking into the uprights resting on them) You could bury the uprights, but use treated lumber for this.
Approx cost in total with new materials $200 CND I'm sure that in the US it costs much less for the same material, perhaps as much as 30-40% less.
I hope somebody might find this useful.