HATER will tell you why. According to him the A520 is on a Toledo chassis right. But the toledo, as he rightly points out, has a beam rear axle, whereas what we see under the back of that motor is a nice set of wishbones. Since your definition of copying has everything to do with parts interchangeability I think you would have to concede that the A520 is ready to ship to you in the USA.
as to comments on the chassis rail dimensions, I really doubt that you can look at that and advise. In any case, does the EURO NCAP test include rear impact? never seen any pictures of that, just front and side. I could be wrong though, since I spend more time driving them than crashing them I really don't care too much about that.