bad luck guys.
i'm sure my new idea will work for keeping my lipo's safe:
also there is foam tape/stuff on the inside side of the metal to hold the lipo in place.
this stuff is only half mm metal so i may need to upgrade to 1mm like i planned. but still its pretty tough and it'd take ALOT to scrape away all the metal exposing the pack or a fair bit of brute force to puncture the metal with a object.
what ya think? not bad for a 2min job