I installed a Pillar metal framed security door to the outside of my front door and it rusted through in six months as we live 100m away from Angels Beach in East Ballina. I wish to replace it with a timber-framed flyscreen door similar to Corinthian 2060 x 820 x 19mm Screen Door Timber 3Lite Fresco 3 However, that's 20mm too high for my doorframe.
Bunnings workshop suggests building one using 2400 x 19 mm timber. How would one join the sides and bearers together?