Didn't read the whole thread you linked and I imagined it was mentioned about the bias, but looks like a good use of fabric.
Your ridgeline will be on the bias of the material, which will make it floppy. The side will pitch tight just fine. I have a couple true diamonds with a bias cut ridgeline. One protected me in a GA summer thunderstorm and the worst deluge I've ever camped in. I have no regrets and its my summer go to tarp, only because its smaller and offers less coverage and I have a hex I like to use in the other months.
There is a video in post 22 showing the ridgeline.
https://www.hammockforums.net/forum/...ad.php?t=21172
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