Oil pump,air pump and mags are now installed on the rear of the engine mount.The fire wall is next and will be installed on the front side of the engine mount between the engine and the aircraft structure.
I decided to stick with the olive green for the engine mount.Most of the the other components are a gunmetal color with the magneto support piece left black for a little contrast.These colors are no more than an educated guess on my part as I haven't been able to find a good reference for this.
When using gesso as an undercoat try to stay away from white, because if it chips or you have to remove paint in some areas for a good glue joint, little flecks of white gesso all over the place can be a nightmare.I use black or burnt umber gesso most of the time for any dark colored components.
If you look closely at the last pic you will see areas where a little burnt umber shows through the green color which actually adds to a more realistic weathered look.
Now it is on to the firewall.