Here you can see the progress of the recoil guard with some of the strengthening ribs being glued in place, they will be sanded down and correctly shaped when the glue has dried.
Here it is clipped to the gun mount.
From this view the two attachment points can be seen.
With all the components dry fitted the assembly is starting to take shape.
Looking from above, usually I start with the largest assemblies to define the shape then the finer details get added afterwards.