Hi Steve, I find placing a white bath towel down and letting it drape over most of the ends of my work bench helps kept the little parts from scattering. Table has locking wheels. I spent to many hours looking for the spring or screw that slides off the table into the abyss. As mention an engine cradle is a must, easily made from foam or even packaging. I'm sure some smart person as them listed on e-bay.
It looks like you have a few different diameters of O track, however I would be nervous running on that outer rail with such a fine model, good luck with the repair, regards Rob W
