RE: GreatPlanes PT-40 construction diary. Any tips/comments welcome!
Do not glue the "windshield" into place. Use some #2 x 3/8 screws and make it a removable hatch. Ditto for the horizontal plywood piece behind the engine. That will give you a 2 piece hatch and make it much easier to get to the fuel tank.
One other tip. It's too late for the PT40, but helpful for your next plane. Before installing the firewall, mount the engine mount to the blind nuts and trim the bolts flush with the back of the nuts. Then remove the engine mount and install the firewall. You want the bolts flush so they don't puncture the fuel tank, and it is easier to trim them off outside the plane.