I'll take that into consideration. I think I'm still going to use those type of weld nut due to the low profile. Perhaps I'll add an additional thickness of sheet metal between them to reinforce things. However, I'm pretty sure that they will suffice. I just did a quick weighing of the components, and everything together weights about 170 lbs. That is only a bit more than myself, and much larger people are held into the car by only four M8 bolts holding the seats to that same thin tin. I would think that 6-8 bolts will be plenty. We'll see how it looks and feels when I go to install them. If it feels flimsy I'll do something to reinforce it.
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