This is meant to be the ultimate protection for my 1.2Ah 6s batteries. Has fared very well with 10% infill in lots of crashes in the last days.

Feel free to adjust for your specific frame:

https://cad.onshape.com/documents/e547de6ae78d8fad8e606011/w/8ff765304af91eb0712719aa/e/ddb7d25efeed57260b866c80

Have fun flying :D