I used a t-shaped ruler -
http://grabcad.com/library/t-shaped-ruler
Modeling Scribe -
http://www.hobbylinc.com/htm/squ/squ10202.htm
Took about 4 hours to scribe the very thin line in the melamine.
Use the thin melamine board - 1/8" x 4' x 8' thick - not the heavy thicker board. The melamine sheet sits on top of a piece of plywood for rigidity and then on the table.
Cleaning options -
http://www.howtocleanthings.com/surf...rase-board.htm
Wax it once in a while with a paste car wax.