Daniel's post about the construction stuff reminded me that Markus recently posted a link to the new Lemkes on the N scale Vehicle list.
This company has a released several versions of the Opel Blitz:
http://www.lemkecollection.de go to MiNisOpel, of course is a european unit of GM, and the sheet metal for the cab looks to be very similar (not perfect) to concurrent GMC/Chevy models in the USA (late 40s into the 1950s):
1949 Chevy 6400:
Unfortunately, they seem to have no US distribution.
Here's a place that does seem to carry them:
http://www.tee-usa.com/store/minis.html(MiNis is also coming out with a cool 1968-1979 VW T2 BUS)
http://www.lemkecollection.de/downloads/pdf/Minis2010.pdfOh yeah, these are 1:160
Mark