Tub floor

Got a 110 (1992) hardtop. Have insulated between the rear tub floor rails with 6mm closed cell foam but am unsure whether it's worth laying some 10mm ply on top of that so that the floor doesn't bend out of shape when I stand on it.

Do you think it's necessary to line the floor with a board as well?

I'll be standing on it occasionally but will rarely transport overly heavy materials.

The reason I ask is because it did come with the floor pre-lined with (very oily) ply.

Perhaps this worthy of being a "stupid question." I dunno, just wanted to be sure before I glue the rubber matting down.

Thanks

i had the same worry with a series 3 i had a few years ago and what i did after replaceing the strutts was to cover the floor with 3" wide tongue and groove maple flooring i had ripped out of an old school being torn down

sanded up and secret screwed to the floor it made the world of difference

in my opinion plywood is nowhere near the quality it used to be unless you get a good quality exterior brazilian ply or marine grade ply plenny of resin in that stuff and a lot harder wearing