Floorpan and Rear Bumper Area - What Thickness of Metal?

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Folks,

I've finally started some pre-welding preparation for my F78.

Behind the bumpers is a pressed steel non-structural cross-member, a kind of rear sill. I'm struggling to get a decent micrometer thickness measurement on this through one of the holes. Is it normally 1mm or 1.5mm?

Similarly, is the load bay and floor pan the same gauge?

rg