I made the engine plates from 5/16" thick aircraft spec aluminium alloy, and finished them with an engine-turned effect. I bought a replica Manx 5 gallon petrol tank from Ray Petty, and a second hand central oiltank of the correct period. I ran the breathers back into a pot, as I had done on the Manx.

Image and description kindly supplied by ManxNortonForSale...