I got this off another snowboard site-
Here is a simple way to build a nice beginner rail for under $50.
SUPPLIES
One 6 feet long, and one 4 feet long 2 by 4.
6 feet long, 4 inches wide iron.
Screw driver
Screws
Saw
Liquid Nails
All these supplies can be found at stores like Home Depot and Lowes.
HOW TO BUILD IT
1. Measure out four 1 foot lengths on the 4 feet 2 by 4.
2. Cut the four 1 foot lenghts out.
3. Screw two of the 1 foot lengths together in the shape of a T. Make sure the 2 by 4's are centered. Those are the legs.
4. Take the 6 feet long 2 by 4 and screw it to the top of the legs near the end of the two sides of the 6 feet long 2 by 4. The wider part should be facing up.
5. Put the iron on top of the top 2 by 4 using the liquid nails. Wait for it to dry, and you have a rail.
http://img1.putfile.com/main/12/36315444112.jpg