Aluminium vs Steel floor

[BenBrooks]

Hi all,

in the book it says to use the sierra roof (i.e. steel) as the floor and weld it on to the chassis but i've seen lots of you have used an aluminium sheet and secured it down with rivets. probably a silly question but are the rivets not a potential weak spot for rusting/chassis integrity and is attaching aluminium to steel in this way okay to do?

cheers

Ben