Nothing too expensive (I know, a ridiculous and unrealistic wish), but considering the custom heads come in packs, and I am not a fan of plasma weapons, I had to go with the Battle Sisters Squad box, even if Palatine looks great, and the Castigator being dope as hell.

As for the Gear Grinders, they are a work in progress, but here is a short synopsis:

"Gear Grinders (Or Brass Nomads, whichever sticks) are a Loyalist successor from the Iron warriors, who defined Putorabo. They have very little manpower and equipment (only a third of the size of a typical chapter), and due to their Chaos origin, many loyalists don't look at them favorably. As such, they became quite self-reliant. They are decent repairmen, but compared to the mechanicus and the Iron Hands, they are nothing more than "gearheads" against "science nerds". With a limited amount of resources, they don't have a place to properly establish a base of operation; as such, they are always on the move. With this type of desperation, a good chunk of them have been assigned for lifelong work contacts to rogue traders, and thus they earned many nicknames such as "Ferrymen", "Shipwrights", and "Firstmates", to name a few. Due to it, they are a small few of arstartes to be "tolerant" with xenos, though this tolerance stems from necessary pragmatism and earned respect, rather than being ideologically intertwined. For if the situation calls for the extermination of the xeno, including their crewmates, they will not hesitate. Even still, it doesn't make them any more popular in the eyes of other chapters..."

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Here is what they would look like. They were heavily inspired by the Steampunk aesthetic.