I know what you mean about the extra strength. On that canopy I glassed for a plug, well, 5 ply 5.6oz glass did not hold. It definitely needed the inner stiffener. I have an order with CST for glass, stiffener, and carbon powder. The next one will be strong enough, especially being I read their tutorial, even if after the fact. Sometime I want to try and make a cowl and just may do so on the next build being the cowl is wrong for what I want.
Needless to say I am watching your work with great interest. This figuring things out after doing it wrong gets expensive.