Thats a nice "dune" tutorial

I saw the Dune 40k army a while ago and I'm still impressed by it.
I'm stll thinking about some things I definetly need:
1. Does anyone know of a nice sandworm miniature that could be used or converted ?
2. I found a lot of nice vehicles, but no really good Thopter. Any ideas ?
3. Any ideas how to display House Ix and Tleilaxu ?
4. How could Navigators be displayed ?
Im going to use the game setting, which means the three houses will fight and try to collect the most spice.