Reply by OnlyJustME

Just use the top layer of the parquet tile since it will be glued down anyway. essentially make your own tile pieces and glue each piece down. a lot more labor then formica but would be all wood then. i think others already gave enough info on the torsion box frame. think of a hollow core door slab; light weight but rigid. maybe you could get one ordered as a 4’x8’ door.

-- In the end, when your life flashes before your eyes, will you like what you see?