I agree with covering the building plans with parchment paper. Works better than waxed paper. Also, I highly recommend keeping an eye out on Craig's List for a used drafting table. You want the type with sturdy metal legs and a 4 ft by 6 ft top. I use this as my building table because it is warp-free. The top will be adjustable for its intended use as a drafting table, but just keep it laying flat horizontal. Find a source of Homosote or other sound insulation board that you will cut to fit the top of the drafting table. This is the ideal building surface for it has the right amount of resistance to accept and hold T pins. I made the mistake once of building on a 4 ft by 8 ft homemade table only to find out that the surface was not true. So, again, highly recommend one of the heavy duty drafting tables that has a 1 inch or so thick table.