Several hours of moving all my tools and stuff out of the chain room freed up the space for Dave to do further cutting.
The metal work you see below with the orange lines is the area to be cut out. This will leave a flatter space to put the flooring over. Railings are staying temporarily for safety as it will be a while before we get the floor in
You can just see the cuts here where it has been taken down. Still a small ridge left to provide some rigidity.