Europa-List: Trigear cockpit module bulkhead install

[Brian Phillips <barp99@gmail.com>]

I was browsing the Europa club mod site, and stumbled across this 
trigear cockpit module bulkhead install in the known corrections. I 
can't find any reference to it in the build manual nor hints & tips 
compilation, and the 3mm ply templates do not show the pieces there. I 
can see there are existing stiffeners in the cockpit module I have, see 
photos, but I do not know if these replace or support these bulkheads. 
Does anyone know if these two bulkhead pieces are actually required and 
do they need to be flox sandwiched into place?

Brian Phillips.