I'm in my office so I can't quickly look at the mailing tubes at home, but...
Hagley Museum in Delaware has some of the WW&F (and W&Q) framing drawings for the passenger cars; I think I have the framing drawings for baggage car #1 and combine #6, at a minimum.
The Delaware State Archives also have the J&S/ACF builder's photos for some of the cars as well; I think I purchased an exterior photo of baggage car #1, coach #2, coach #5, combine #6, and open car #7. There was also an interior photo of #2 that I bought as well.
Dave Crow