This just gave me hope (glamping stuff are super expensive!). That 15th century glamping history bit is inspiring. If they could do it then, well...I'm going to do it now. Thank you!
Same size as your tab top curtains across, little extra on ends to slide in cross brace of side poles. He tells us around a little after 4:06- 4:11 in Video, around 8 ft because that is the size of the Tab Curtains across. Comes already pre cut that way at Lumber Yard.