Making progress now.
Yesterday I cut a template of the fuselage firewall from a scrap plastic container and hot glued it to a block of lightweight cement wall block cut to the correct length of the nose section. A glow spinner was hot glued onto the front face of the block and the plug was carved to shape using a junior hack saw as a shaping tool. It was given some filler and left overnight.
This morning after some sanding it was placed into the neck of a pop bottle, which had been cut into two, with the spinner located firmly into the neck opening and heat shrunk with a heat gun.
The finished front cowl was knocked off the mould by hitting a rod through the bottle neck and onto the spinner top.
Being clear plastic this will now make it easy to see the motor and ESC inside the cowl, making it very simple to set up the motor mount and position the ESC within the cowl .