I remember these kits, mostly from hobby shows as they were a little before my time.
The plane kits could be built up into very nice desktop models, they are no different than the high price solid wood offerings available today.
I know the train kits were certainly "poor" compared to modern offirngs but back in the 40's when HO offerings were pretty thin, the car kits they sold were often considered "mainstream". Gotta love the printed paper sides.
http://www.collectair.com/strombecker.html
http://www.collectair.com/strombecker2.html
Have fun with your trains
Get the Garden Railways newsletter delivered to your inbox twice a month