The last piece of fibre glass blanket has been put in place and epoxy resined onto the inside of the transom

The next step is to sandpaper all of the inside of the hull (excuse sideways photo below).

You may recall the monster job sandpapering the outside was, so I have invested in a top of the range sanding system from Mirka. The sander is high performance and very quiet, it is also dust free as it is attached to its own extraction system (Vacuum). 

The extraction systems takes its power from the domestic supply and the sander is plugged directly into extraction unit. The switch (picture below) on the unit is set to Auto, so that each time the sander is used it switches on/off the extraction unit.

My only reservation is whether or not the sanding disks will be strong enough to withstand the harshness of the fibre glass. We will see.