Here are the models from the Sisters of Battle Combat Patrol boxes. Per the codex: „The pilots of Pentinent Engines are subjected to terrible agony, thanks to the torment amplifiers spliced into their synapses.“

The pose of the figure on the right in the above picture was modified a bit by repositioning his right leg and arms. Otherwise, they’re both the same model.

I tried to follow the box art – pretty much dry-brushed Vallejo Gunmetal over black – and washed with Vallejo Black Ink. Gold and other details were added – also some of the engine cowling/covering was painted black and given edge highlights.

The picture above makes me think of Tweedle Dee and Tweedle Dum.

I couldn’t find the fluff/background in the codex of how these „pilots“ came to be in the engines themselves. The way the box art shows their pants (the only clothing remaining on them) makes them look like they were prisoners.

Pictured above is a comparison with a Battle Sister.