Has anyone made one of his PVC blinds?

http://www.huntingnet.com/fieldjournal/fieldjournal_detail.aspx?nID=452

I was utilizing method #2 without the corners and when I finished I can't see where his instructions work with the enclosed end. It will always be too high on the box corner. There must be another modification to make it just right.

Can you leave him feedback or is his email listed on here?