I had an idea for a time now to build some narrow gauge to go with American 1:160 N scale.
Maybe something to do with a mine?  I have the Walthers kit...
Don't see a lot of steam chassis about.  Is the situation with Marklin really that dire?
And the only other is Rokuhan?   
Any Z chassis kits?

Never seen any chassis kits. 

I always assumed Marklin was the only source for Z steamer chassis, I wasn't aware Rokuhan offered any steamers until googling just now