Screwed..........??
Not really.
Dry run on the ply, to recess the flat head screws.
Somfollowing that, I got back onto the plymsides, fine tuning the fit, drilling pilot holes for the screws into the sides, and then came up to the house to lay out the carpet and cutting to fit.
Catscan.
Cut to size.
At this point I decided to call it a night, rather than glue the carpet down.
Pretty pleased so far.
Mojo headed back.