Thanks for the pics. This setup always works good.
In a round cowl with a single cylinder engine inverted it is easier to split vertically in a fore/aft fashion, or even put the baffle forward of the engine. This provides a lot of surface and options for air extraction. Only attention point leftis the rear mounted carb, that needs a cool air space of it's own, like maybe a box around the standoffs, open to the fuselage.

OTOH, that could be done along the lines of the lengthwise split cowl method as well.