Nice job! But how does it react to a hard ball hitting it at pace? I fear your effort may be short-lived in practice.
It's absolutely fine. My dad used fishing lines on his bat about 20 years ago and there was no adverse effect at all. Some believed it also added a bit of a "spring" effect when hitting the ball too. A much larger area of the bat was covered on his bat though so will be interesting to see how these two thinner areas hold up?
I think I mentioned using fishing line to bind bats on a thread some time ago, but I can't find it?!
Forgot to mention, my dad used nylon fishing line rather than braid.