I fitted the exhaust system and found the fuel pump to carburetor fuel hose far too close to the exhaust pipe so I rerouted it. This then required repositioning the hose fittings. I checked the engine breather line routing and found an interference issue with the exhaust and propeller control cable routing too. I had to reshape the breather tube at the top end and the bottom end will also need some adjusting to fit properly with no interference. Lastly I experimented with different positions for the lower exhaust pipe support installation.
