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Originally Posted by freebeard
Absent a picture of the bare sheet metal:
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The videos show the sheet metal hole. I know that watching the videos is boring and a struggle, so here are a couple of pictures.
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The brackets could be contoured to a shape that would spread the contact with the thin sheetmetal over as wide an area as possible and then the battery box would bolt to them.
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No offense, I guess I'm not convinced that it would be strong enough. I'll bolt the box to my aluminum frame (rev 2, after I finish messing around with the 2 x 4s). It's me that will be in front of that battery box in an accident and I'm doing everything I can to make sure it does not crush me.
I'm not welding anything to the frame of the car.
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My plan is to weld the battery box to a 4-point roll bar.
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The roll cage sounds like a great idea. I have not investigated whether a roll cage will fit in my car.