I won't argue that I'm not a snob... because I probably am. But why paint a masterpiece on a stretched bed sheet when canvas is so much more inspiring to work on?
What cheap motel room have you visited. ;D
Our N Trak club built a portable layout (4'x6') about 12 years ago out of Baltic birch, This layout has been abused more than anything I've seen. It's been exposed to -20 degree weather for months, damp basements, heat and has been banged around as much as a boxer. It's still as square and as pretty as the day it was built. Compare that to some of the earlier moduals built of pine :-[
Mind you for moduals, now we use 3/8" fir and it works great. (not quite as nice looking as Baltic birch but almost as sturdy)