Plan to put seam sealer on the sewing at the corners where the loops are that the shock cord attaches to inside, keep water from running down the shock cord to your groundsheet. Any extra water inside the mesh is undesireable. If you arent buying the cuben groundsheet, you wont have the issue, but it will still leak. Joe doesnt seal this because it is outside the cuben groundsheet.
Consider putting sealer on the endwall tie-out loops as well, at least check that there is not a trace of wrinkle under the tape patch that seals it inside. Under tension this can pull away and wrinkle, then it leaks. You might not even be able to see the wrinkle, thats why its a good idea to seal it. I stared up at a steady trickle of water running down my roof right above heads one night, it never dripped , just ran down the roof, from the tie out.

