Thanks for the link Mark! I knew there had to be something out there on the net. The business car Lowell Smith used for the Feather River and Number 99 would not be correct either for the NP business cars. However... the observation car that Micro-trains has been using for their regular offerings thus-far... 'appears to be' fairly close.
FYI... for those who may be Northern Pacific passenger car fans; or, those that like business cars... Lowell Smith has posted the next run of business cars in the Northern Pacific in Loewy inspired NCL two tone green scheme. Very nice looking... see the linke below: http://lowellsmith.net/executive.html