One of my favourite kitbash tricks is to take an inq54 part (especially a torso) and turn it back-to-front.

Gruss’ torso back to front
I also used the same trick many years ago with slick devlan’s torso
I’ve turned around the space marine torso to make a chaos space marine. works quite well i think as the cabling is straight.
The torso on the figure on the left is from the Andrea range. Also back to front.