The rail build continues, the strips are added and follow the rib contour, this may need to be adjusted due to the square (ish) section of the strips, if the strip looks like it is sitting proud of the preceeding rail then adjust the concerned ribs ( usually the ribs in the centre of the board ) with a craft knife, dry fit the rail for fit then glue and clamp. In this build there are seven rail strips per side, the last two are Cedar, for no particular reason, I just happened to have them handy, these rail strips are almost completely sunk into the ribs, again this can be achieved with the craft knife, the fifth rail strip will be planed so as to form a platform with the two Cedar strips for the deck to sit on, so when planning or sanding these it is important that they follow the top profile of the ribs, if the ribs have no dome and are flat then the rail strips will be planed flat to take the deck,but who wants a flat deck eh!