Nice work Mike, I like the trolley.
Another little tip regarding paint chipping - when bare metal shows, it's very rarely 'bright silver', unless paint has been knocked off violently, by a bullet strike, for example. Add a very small amount of matt white to the silver, which will give more of a silver-grey aluminium look. For prop blade wear, apply this sparingly and gently, in a dry-brush method, using the edge of the brush along the edge of the blade, with a stroking motion, feathering it where required. For 'foot wear' or other 'worn' areas, a soft pattern of very small, triangular areas, applied carefully then gently smudged with a finger tip or cotton bud when almost dry, works well. Very small, fine lines, some perhaps criss-crossing each other, can simulate scratches, and can be done with a fine brush or a silver pencil.
It'll look softer and much more realistic.