For the brackets, I taped off all the threads. Took a 2x4, drilled a series of 1/2 inch holes every 4 inches. Plunked the brackets, shackles, bolts etc into each hole as a rack. Could then rotate the parts easily. First coat, however, I simply laid them in a row along the board so I could first spray the undersides.
For the steering column, took a piece of particle board and drilled a 3 inch hole in it, so it could stand as is shown and be rotated. Other stuff I did as I could find space.