Floor repair / replacement
I've finally got the floor out of my short bus and it's time to start redoing it. I'm looking for a little advice. The old plywood subfloor was a mess so it has been torn out. I don't want to do a proper insulated subfloor because head space is very limited, so I'm planning to put down 1/2" plywood (like it had before) then laminate wood flooring on top.
The metal underneath is in ok shape, but there are lots of holes from old bolts, rust, etc. What, if anything, should I do to seal those up underneath the plywood? Should I go with marine grade wood? Should I put a layer of anything between the plywood and flooring?