Gearhead wrote
I think there is a subtle difference between thickness and width
So sorry about that mistake, please see it in your heart to forgive me.
Gearhead wrote
In fact Firebirds are thicker than 40mm in the center...
Could be, according to the plans I have for the Gibson Firebird Studio its 40mm throughout.
But thanks Guido and Mike for your comments - that's always an option Mike if I see I need the extra thinkness