I use a 2'x4' accoustic ceiling tile on top of the work bench. Other use cork boards, dry wall, and there are also metal boards that you use magnets instead of pins. I tried drywall, and preferred the ceiling tile as it was easier to push the pins in. You can pick one up for $3-$4 at Home Depot or Lowes. Just remember to use a good flat support surface under it (work bench or desk) to prevent building in any warps.

Lay the plans on top of the board, cover them with Wax Paper,and then build on top of the plans is the usual way to do it.

Brad