Not worried...used tape from the inside, and thin super glued from the outside. It was caused by me when pulling it over the wing and it caught on a shrp piece of metal and made the hole. It is possible to over heat it and cause a hole.I find this very interesting, do we have any real feedback or other news of those who have tried it in the past. Often bad results are not shared however I believe we learn more from our mistakes than successes. That is not to say it is bad but we have no good reports either. Post 13 has something, wonder what the final outcome was. The MATO link pictures show some holes in one place, how did that happen, does it worry the builder?