Okay. Did a couple of things over time. First was the beading around the inside of the hull plus the 'Cross Beams'. Measurements were taken from the RNLI Plans and a decision I had to make straight off was whether I was going 'fit out' the interior of the cabin as this could/would have an impact on the 'Cross Beams' in order for the Superstructure to sit into the hull. For those not familiar with a Mersey, you step down into the main cabin which effectively puts you below the deck.