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Yes, I'm not that familiar with using rivets, and I don't have a riveter tool. It sounds like a good and satisfyingly quick process, although I'd be concerned about any protruding rivet heads, especially on the inside, as these plates will potentially be pressing hard against the battery wall. Maybe flush rivets are available?
In general I'm a fan of screwing and glueing (epoxy) for aluminium. The screws clamp the glue joint while it's setting, and then give some security against sudden catastrophic failure in service. If the glue line fails the joint will become loose and visibly wobbly before it gives way completely, and the epoxy prevents those miniscule movements which can cause mechanical joints to work themselves loose or strip threads over time, ...as well as providing a waterproof seal that protects against corrosion. Aluminium doesn't normally corrode if it's out in the open, but if two surfaces are close together - or if a paint layer is broken - then corrosion can happen in between. (This may not apply in sunny Australia or sunny California!)
Fortunately, here in rainy England we don't often need to worry about 45 degree weather! I used to monitor under-bonnet temperatures as I was aggressively blocking my grille even in summer. It was all within acceptable limits except on long drives on summer days when occasionally I would see the under-bonnet air temp creep up past 50 degrees towards 60 degrees, at which point I would stop and pull off some of the foam blocking the grille. Even at those engine bay temps the engine itself was never even close to overheating, and the fan would almost never cut in.
But 50 degrees, yes that's not unusual, and that's too hot for the Odyssey batteries unless they are clamped together in some way. The tech guy I spoke too didn't think that temperature would shorten the life of the (clamped up!) battery significantly, a) because it's not being CHARGED at high temperatures (charged at night from the mains) and b) because those elevated temps only apply while driving, which only accounts for about 5% of the time.
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