Here the 2nd prototype draft with measurements, in mm
RH or LH side depends from the face worked
and the cut of the same, precision is NOT needed
after the hammer and gridding work, the RH prototype is ready- difficult is to make the TWO pieces RH and LH equals
not a lot of work just few minutes with hammer on a hard wood piece-
cooper is easy to work and to chrome or also silver plated
NOTE: my measurement can be different for your cars- i have one obscure GAP of 2mm from my shroud and cockpit trim aluminum at RH and LH side-
SO my measurement 25mm can be more large, than normal cars and 23mm can be the right measure
Cheers