What exactly are these problems? Apparently issues with the structural integrity once material is taken out from the top of the car. The i8 already uses lightweight materials in coupe form so it seems they are having a problem with either the body or chassis flexing. An unnamed BMW source stated the following, "The last architecture presented some fairly major challenges, to be able to produce a convertible in that format. The rigidity was hard to find with that particular architecture."
Who is this source? Is the report accurate? There is no official BMW statement on this matter. The i8 coupe is basically ready to go with pricing and specifications released back in September. It will be interesting to see how long it takes BMW to fix these issues and get the Spyder on the market.