Another new firewall was cut after measuring the boat. 2 pieces of 2X2 were screwed to the firewall so it can be screwed to the deck and support the seat. Since the firewall sits at an angle in the boat, these pieces were cut for the proper angle when the firewall is in the boat. The hole on the bottom will allow access to the front engine mount. This actually was required when I aligned the engine earlier this year when I replaced the lower drive bellows.