Short update: other priorities have kept me from making much progress over the past two months, but I continue to survey the truck's current condition, and I have started to accumulate parts that I will need to address first various safety-related items.
Regarding the upper fuel filler pipe, the original piece was under the extra wheels in the bed. I suspect the transport guys tossed it there. Why they wouldn't have put it in the cab, I have no idea. To close out the earlier discussion, the folks at Classic finally answered my question, but did not clarify fitment. Based on the Master Parts Book entry, I do believe the piece is the same for '47-'48 FC100 and FC150 models. Thanks, Bill.
I've found two areas of rust-through, neither of which is too extensive. Both areas are where the cab floor meets the side panel - both passenger and driver's side - and neither looks to be too tough to repair with new metal patch pieces (see photos). The doors are in good shape. The seat could use some TLC but is serviceable.
