OK Nick, we're trying to help here. Three guys have said "ceiling tile" and now I am the fourth to say ceiling tile is the perfect solution to your problem. Inexpensive, lightweight, pretty flat, easy to stick a pin into, easy to pull a pin out from, but holds the pin tight while the glue dries. This is not rock-hard ceramic tile, this is soft, lightweight, compressed fiberboard. It comes in pieces 2' x 4', half inch thick. If you have a long wing, put two tiles end to end and you have an eight foot building surface. Any building supply store will have it for a few bucks apiece. Put the white textured side down on your table, work with the brown unfinished side up.