Nice start. The boxes were probably the same colour as the bulkhead, but somewhere in one of Guttorm's threads there are pics of the inside of a Heinkel, which might help.
Pity you couldn't have waited a couple of weeks, and entered it in the BoB GB.
Just stumbled on a hiccup there are no radiators incleded like the box art just wacking great holes i an considering some card with green stuff to scribe a radiator onto