[Richard Coutts-Smith]

Well I can say that 16 kgs of ammo box to the UK from Aus. cost $150, and will take 3-4 months sea freight.
The cost for the nose cone would be prohibitive I would have thought due to its size as well as weight, you can't post it via Aussy Post, it would need to go through a freight handling Company and consolidated into a container load
Andy, the problem with getting rid of a nose cone is that they are generally indestructible and so easy to get hold of. I swapped mine for 4 photographs and was more than happy to get anything at all. Put it on E-bay with very low start price and you may get something for it, it will probably go to a good home, and you will have some space.
That said, welcome to MLU, there is a lot of information in the Brains Trust here, sure you have tried the Search facility, if in doubt, ask.
Rich.