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It does not matter if these are new construction windows. If they were manufactured with a frame. the sill should be in place. If you stand the window upright as it would be in the opening, is the bottom sill slanted toward the ground? If so, the slope is already built in. David

If you have ready-made windows, you will not need to construct a sill. The proper slope and external drip edge is already built into the window. Just make your rough opening slightly bigger than the window and nail it to your coop via the nailing flange (plastic flange with holes in it)...