Body/floor/interior rivets and rivnuts

[voucht]

Hi,
I'm going to get my chassis back from the sandblasting/powder coating at the end of the week.

I will soon put the floor, interior panels, and I am also going to receive my body kit from Equinox some day this week.

My floor will be made out of 3mm thick aluminium, inside panels out of 1.2mm thick aluminium. Thickness of my tube walls is 2mm.

I was wondering what kind of rivets do I need to buy : diameter? length? Are aluminium rivets OK? The books says 3mm rivets for the inside panels and body elements, at 50mm spacing. Do you think this is OK? And will this rivets spacing and diameter be OK for fitting my aluminium floor too (3mm rivets sounds a bit small to me)?

also, where did you use Rivnuts to be able to remove the panel?

If you guys would like to share your experiences about that, and give me good advices, I would be glad

Thanks a lot.