Re: [Calvin19] Tailpocket question.
You don't need to un-stitch the Tail Seam to add Tail Pocket. Just sew Tail-Pocket directly though (top bottom skin) with backing on back side.
It is perfectly acceptable. That location And % surface is also acceptable I do believe by 'Poynter manual' as OK. If I am not mistaken Poynter even allow a greater% amount of surface area in tail section to be repaired by patch strait through at Tail area.
For BASE, I have done for people and jumped several tail-pockets strait though top-bottom of canopies with out a problem. Structural integrity by repair/Patch or tail Pocket or even both at same time. That for down by the tail seam Pressurization is 'little' and canopy repairs sew strait threw top-bottom skin with patch/Tail pocket are Good-to-Go.
.
edit; to add
If I saw this a few days ago. I would have sent you a dimensions/pattern for tail pocket,
.