Yeah that would be the best way to go about it.It would be ridiculously expensive. It might be cheaper to sell your CLA, take the hit in depreciation, and then buy another CLA with the pano sunroof. Think about it, I don't think any dealer would have any parts let alone be willing to modify the roof to add the genuine MB pano roof. So you'll have to ship it back to the factory in Hungary and then back again to the US. The shipping cost alone will kill you. Plus the cost of the actual parts and labor you're talking some serious money.