Spacecraft . floor assembly Posted on December 1, 2015December 5, 2015 by dkoa set of three welded steel box trusses, pre-drilled and assembled together with two ply 1in marine plywood and recycled industrial rubber conveyor belt flooring. Three (3) welded steel box trusses required for this floor assembly. Share this:TwitterFacebookEmailTumblrLinkedInLike this:Like Loading... Related