One thing I didn't know,until I tore it out are my crossmembers were rusted on top from contact with the wood.I cut off the top of the C-members and welded on 1 1/2" angle iron. You might check your board thickness mine a 1 1/2" I am using 2x6 tounge&groove I have about $180 in lumber+hardware.
My bed is 8'x12'
Deckboards might be too thick yours look 3/4" deckboards are about 1"
Good luck!
