I know what you mean Malcolm, but our 125i hasn't worn at all over the cross bars. I know some of the MINI convertibles had this trouble though. I seem to remember VintageB3 had repeat trips to the dealer to get it fixed.
Thing is, at the end of the day, these are "concept" shots, so the finished article may have a more refined finish to the hood. I guess time will tell.
And again, like the coupe, beauty is in the eye of the beholder - we LOVE the look of the soft top and don't think it looks wrong or unsightly or even remotely like a pram. At least, no more than the likes of a boxster, etc.