I've come up with some modelling ideas for a 'feral' imp guard list and I want to hear what folks think. about 'em.

The list fluff puts this force as a remote death world's militia. The planet of Ulundi IV in the Natal sector of Keate's drift has been out of contact with the imperium for centuries due to warp storms. As a result, any equipment that relied off-world technical support has long since been cannibalized for parts. The militia luckily had a large depot of infantry weapons.

With the loss of imperial technical support the planet's population has suffered as much of its infrastructure has collapsed. While this has forced the population to steadily revert to indigenous ways it has not dimmed their faith in the emperor. This has resulted in the evolution of tribal cultures worldwide.

The militia has had to make force changes accordingly. Native fauna has been conscripted into imperial service. The standard militiaman comes from a hardier stock of tribesman than his urban predecessors. Militia detachments are often the personal guard of the local ruling tribal clan.
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Tanks

Leman Russ stand-ins are lizardmen stegadons fitted with cannons, machinguns, and armor plates.

Basilisk stand-ins are field guns mounted on wagons and pulled by boars.

Infantry

They are all covered in war paint, feathers, and hides. What armor they do wear is piece meal at best. The sergaents and officers carry warspears and lizardmen shields Veterans, vet. sgts and officers wear hideous masks to terrify their enemies. Heavy weapons are often decorated like indigeous predators (with chaos vehicle sprue bits).

Cavalry

Rough riders are mounted on cold ones and carry lances and shields. The riders wear headdresses made from ferocious predators.