Starting to construct the water tank, making the baffle plate fit and cut the top to fit inside the top lip of the tank.

First shape the moulding pattern to fit and then cut the moulded baffle plate  

The moulded baffle plate released from the plywood panel 

The baffle plate cut to fit the inside faces of the tank 

Then it was the turn of the top panel to get shaped to fit the tank 

The top panel released from the moulding panel and ready to cut to size and shape 

The pattern being used to make the pattern the correct size and shape before cutting the panel. I cut the inspection hatch holes to be able to fit the top in the correct place once it is cut to size.