This is an old trick to organize pieces for painting and hold them until assembly. My parts rack is two pieces of 2" x 8" lumber stacked and drilled with numerous holes. (Pieces of 2" x 4" or 2" x 6" would work fine, too.) You can use scrap wood and drill the holes to your liking, making it thoroughly adaptable to your building style and virtually cost-free.
Tip submitted by:
Gerald Baker
El Paso, Texas