Floor Fixing

[Dan]

Finally getting round to doing my first job on the kit, how have you fitted the floor panels and tunnel centre sections, not sure if I should be using rivets, rivnuts or a mixture of both, did you drill the holes and then fit them later or just put them straight on.
I was considering using rivets around most of the floor pan and then rivunts for the inner rail with the tunnel section so it could be removed.
Any advice at this early stage would be great. I just need to build my confidence up at the beginning, I'm sure I'll be fabricating my own brackets and wot not in no time...