This is the start of the stern. Its cut to the Vee shape needed to let the water flow round the sides of the hull to pass the prop and rudder
In centre is the engine cradle, behind that is the base of the engine room bulkhead
Next, the swim sides are being added. The Vee shaped off cut from the base plate will be added to sit on the short swim sides and project out to the full 10'6 hull width.