I have a few quick questions about cork roadbed. I bought Midwest cork at a train show a little while back. However, I can't get it to curve. The sides aren't beveled, is that my problem? Also, this cork is very wide. Can I trim it up a little on the sides? And the cork is the right hight for a siding, but not the main line. For N scale, what hight of roadbed do I need for a modern mainline?