Hello all, I'm installing a dickinson heater in my Beneteau 361. I'm down to the final job of cutting through the deck and putting in the chimney. The question I have is: Is there an easy way or product that will accommodate my slanted deck (where the chimney comes through (port side bulkhead) Do people sand down a block of wood? Use a bandsaw to get the right angle? Thanks in advance for the advice! Captain of the BananaToe