Hi Rate1
Also I am planing to leave the part that is mounted against the firewall and holds the cowl as is. This as I don't want crap like fuel and dirt coming into the fuz. But yes I agree with you these two parts are heavy.
You could by a 1/2" (or 12mm or so) End Mill as used by model engineers and remove some material from the Cowling Bulkhead without cutting all the way through. You would ned to clamp the part to your drill press to stop it flying off into the ether tho'
Cheers