I have just had the same fitting issues with the Hobby Design Hamann Fiat 500 trans kit. The front and rear fitted perfect but both side skirts were bent like a banana and were several mm too short.
The Hobby Design 722 SLR GT trans kit I've just got has a bonnet that is so twisted its unusable too.
There seems to be an issue with the resin Hobby Design is using as I've never seen a similar issue with any of the other manufactures resin parts I've had experience with like Hiro, S27, Fisher, Modelhaus, Replicas & Miniatures.