Fairly straight forward to attach the firewall spacer. Just make sure to dimple the right pieces and also the mating location on the fuselage before getting to far. For some reason I had only dimpled one side on the fuselage, but went ahead and dimpled both sides.
Firewall spacer in place
another view of firewall spacer attached
Make sure to dimple the mating corner holes to teh upper firewall and spacer