Panelling the floor

Dry fitted all the aluminum panels.  The floor will have rivets every 4" along, and the other panels are riveted with 3.2mm rivets.  The manual suggests that the panels should be installed first, however I agree with Tim that these will only get in the way.  I have drilled, countersunk, and de-burred all the holes, test fitted the panels, and now put them safely out of the way.  I will refit the floor as its going to be hard to do this with the car the right way up.  The others can be fitted later.