You can use a hot glue gun for laying the roadbed and then the nails to secure the track to it.
Doesn't anyon have some pictures of their z stuff? The scenics above look great but no trains in the pictures. pete
Nightowl I've been away from this site for awhile but just now have seen your pictures. First thanks for posting them. We don't see all that much Z on here. Second it looks like you have a great start on a nice layout. Tunnels and bridges are always interesting and with a triple track mainline you can run at least three trains with the block system or many more with DCC.
I was looking on Yutube this afternoon and found some very nice Z scale layouts that you would enjoy seeing. Just type in "Z scale trains" and watch a few of them. Please keep us posted with your progress. Pete.