Re: Wheel arch - will rivets hold it!!!
I am assuming that you are bonding the panels as well as riveting so that will give you some additional strength. Also from your video it looks like there is a bit of interference from the weld at the top of the suspension attachment where the panel sits. A bit of beveling on the inside of the panel should correct the fit somewhat.
As far as the rivets, depending on what size shank and head you have you may be able to size up your shank and keep the head diameter the same in order to get a stronger bond, but the panel must be flush as I am sure you have found the rivets need to be set fully as they don't pull in like a bolt.
It appears also that the panel needs a bit more of a bend in the diagonal line, and some taken out at the bottom...just a slight tweak.
I would suggest more rivets along that bottom rail, but I suspect you are spacing your rivets to get a uniform look and it would not present a well-planned job.
I always use stainless rivets in the difficult areas, and there is always some discussion about the reaction between the aluminum and the rivets, most of the chassis are not seeing the conditions that cause the corrosion on a regular basis so we use them.
One question I would have is if you using closed end rivets for attachment, and what head size are you using?
Nice build by the way, keep up the good work.
Scratch Built Spaceframe, 289, Pin Drives, ZF Box