Moving on, I now cut the shape down into two small "elbow stacks" to work on them individually. Repeatedly test fitting them into holes I cut out of the cowl, I further refined the shape and size of each stack. Once satisfied with the stacks, I cut two light ply rings that I glued to each stack as a backplate to fit up to the inside of the cowl.
I'll hold off on gluing them in place permanently until after the plane has been painted. I did however proceed with painting the stacks with hobby enamels and weathering them with waterbase hobby acrylics. Lastly I clearcoated them with clear acrylic.