The file 'WH40KTwoSkullsOneSpike 3D Printer Model' is (stl) file type, size is 1.0MB.
There are a few Rhino Vehicle proxies to use on Thingiverse, but there isn't much in terms of customized parts to make them like the Chaos Rhino's.
I found the skull itself elsewhere on thingiverse (need to find the source!) and added the spike.
Edit: Added a single spike without any skulls on it too, to allow you put loads of them over your transport!
Singlespike.stl | 538.5KB | |
TwoSkullsSinglespike.stl | 1.7MB |