G’day Craig, hope you are safe & well.
Did you get any replies to your enquiry mate?
My maintanence team has asked me the same question this morning. The one fitted to my L-5 was plywood and we are not sure that is correct so it now another little job in the resto project. We have a poor quality drawing from Aircorps but it doesn’t say if its meant to be metal, wood or have the dimensions, etc.
Hilly