Has anyone had any luck with using die-cast vehicles as a shell? I'm having trouble finding a kit in plastic for one of my projects. The plastic kits are either too small or are extremely hard to find. And are pricey.-- I know the metal will be more difficult to cut and it's not flexible, but has anyone tried this? I'd like to stick with just plastic kits but there seems to be an abundance of die-cast models at a cheep price.