Will post more pics when get home. If u look closely u can see zip ties. I used those grooves in between the diamond shapes as a channel for holding zips in place. Hides them well too. I literally just took the roll of mesh and cut one piece that fit bottom portion exactly. The opening is exactly 6” vertically. I cut the two upper pieces using outside dimensions as template-just held it up to it see guide. Any imperfections in edges are hidden on inside.
Did this last weekend but used 7" instead of 6".
After seeing yours I went with the 7".Thanks for your writeup on this great mod for cheap.Probably best. I went back in and tied bottom edge down with zips. A little overhang probably helps.