The reason those distortion effects are there is because the metal isn't perfect like it is on 3d models. The metal is old and warped ever so slightly, not enough to notice the grooves, but enough to really mess with light. I'm not one for 3d programs and the like, and because this is in the photoshop forum, it tells me that this may not be a 3d mesh period. My advice is to go do it by hand. If you look at the example you posted the link to, all the highlights are REALLY blown out, very flatly coloured, with 2-4 step colours gradients which wouldn't be difficult at all to achive in photoshop. All you gott do is mess around. Also, do a render clouds filter on a new image, and then really blow out the contrast. Similar effects come out of it. Maybe by doing that, then playing with the tilt and skew transforms, along with some layer work might get what yer looking for. then again, I could be completely off...