Hi mate
When my kit arrived i had a large crack in the top of the chest piece. Jim sent me out a replacement straight away so Im sure he'll look after you, I know he's in the process of changing shipping companies though.
While I was waiting I decided to see if I could repair the damage though. I started by using superglue in the crack to hold it together. Then I used Araldite 2 part epoxy resin, smeared thinly on the front, more thickly on the back for reinforcement. Once sanded down the result is quite smooth, I'll be interested to see how it comes out when I paint it.