The nature of the planks overlapping on a Clinker built boat give it strength...but on the mold more support is required to keep it straight and rigid..
For this we obtained some lengths of gutter...these were almost cut through every 3-4 inches with a hacksaw...leaving just a sliver holding them together...these were glued to hold them in place...
We also added a quadrant section along the back of the flange...
This was also partially cut through and glued in place...
