Working on the catfish tube chassis. This uses two material IDs. One for the smooth sections of tube, and another is a sculpt/bake for the shock towers and tiling weld strips. It splits up like this: The result is pretty good considering how much surface area there is on the all of those tubes. MatID1 has a 2k normal map…
I did a scan tutorial a while back: http://www.alecmoody.com/rubble/ For big objects I tack togther a steel tube fixture to hold it in the air- usually I am left with one or two bolt holes where my object attaches that I still need to clean up.