Rivnuts - Weakening Chassis

[nickharding]

Noticed everyone uses millions of rivets to hold on all of the panelling. I can get hold of an unlimited amount of rivnuts. Not sure if you know what they are but you countersink them and work the same as a rivet but are a nut. Super strong too. Once applied they will be flush with your tube. Then same as normal stick the ali sheeting over the top then bolt through it into the rivnut. Only concern is weakening the chassis? I plan to use 1 rivnut every 8 inches (8 inches apart) but to apply this rivnut, i will have to drill a 6mm hole for each one. Should i be concerned about weakening the chassis? don't suppose its any different to having a 2 - 3mm hole 2 inches apart?

It just means that access to all of the underneath and inside can be gained by just removing the bolts and then the panel. Instead of having to drill the rivets out and have them rattling about inside the chassis each time.

P.s I plan to put in extra bracing around the place for added strength.