I believe you are correct Bo. My layout is a compromise between the drawing arrangement and the location of the IP bulkhead in the Datafile plan drawings of the fuselage. The Datafile plan locates the IP bulkhead further back from the firewall than is shown in the cutaway drawing. This may have no historical basis and simply be based on model construction factors when the plan was drawn. However, The fuselage is the same width at the firewall and either IP location, so I'm not sure why the plan would not have located it further forward. Whatever the case, the tank appears to fill the space between the firewall bulkhead and the IP bulkhead, so I went with the plan IP bulkhead location and made an "extended range" fuel tank

to fill the space. It's probably too long, but that's assuming the cutaway 3/4 angle drawing is accurate (I can think of no reaqson why it wouldn't be, other than human fallibility). In any event, the upper cowling will completely mask my sins, and upon it's installation we will never see the fuel tank again.
Speaking of the upper cowling, I'd like some input on fabrication of the cowling and side panels, which appear to be aluminum in the prototype photos. I've been thinking about using either thin metal, a la Bo's Alby, for these, or thin sheet styrene (ten thou) for the side panels and vacuformed or push molded sheet styrene (20-30 thou) for the top and bottom cowling. There are pros and cons to both approachs. The metal would require a sort of smash or hammer molding process like Bo has done, which would require that I learn a new technique (always a good thing, but sometimes approached with trepidation). Metal would also look better, most likely. However, rivets and screws might be more difficult to simulate--there are plenty of them on the side panels. As for plastic, the main drawback is appearance. I suppose I could use Mr. Color Aluminum or Alclad to get a finish close to metal, but it's still not the same. On the other hand, rivets and screws are more easily simulated on plastic with resin decal strips from Archer, which will be covered with the metallic paint. In any event, the nice aspect of this is that I can experiment a bit with both and see which I prefer, before attaching anything to the airframe.

What is the considered wisdom of my friends and modeling colleagues on this issue? Thanks for your input!
Regards,
Bob