I know this is a really old thread, but I’m surprised at how many nay-sayers there are. Sure, people (arborists, rock climbers, abseil), die every year from their own made gear failing- but there are thousands every year that don’t…. As long as you’re doing it correctly….
I splice and sew my own slings and loops, and would gladly bet anyone a handsome sum that if I sent them in to Sherill to get tested, none would fail below 85% rope test. Any takers?