It can work if you know the exact location the bird/turkey will be coming from. However if shooting with a bow you're allot better off using a completely enclosed blind.
Although the porta roof will work, you'll have to wait until the bird turns away to draw your bow. In the past I'd used the H.S. Strut collapsible super light blind, it rolls up for storage and opens to a 6' length and 27" height. You can actually encircle yourself with this and cover your sides.