Soldiers of the Emperor charge forward with support from a squadron of Scylla Light Tanks.
I saw these conversions years ago on the GW website, but sadly the article is no longer available and I can't even give credit to the author. They were made by cutting down the body of a Chimera kit to make the basic chassis and I used plasti-card to fill in any remaining gaps in the hull. It was a fairly involved conversion project and the results are probably some of the coolest models in my collection!
These tanks were presented as 'counts-as' alternatives to the Sentinel walkers for armoured companies and fit my Death Korps of Krieg theme perfectly. In friendly games I use the tracked vehicle rules rather than the walker rules, but otherwise they are still Sentinels and fill a Fast Attack slot.
Next week I'll post another conversion to make a standard Imperial Guard model fit into the Death Korps theme...