I've had a rough version of this in my vehicle area for a long time now, and I decided on a whim to try to finish it. Very soon I realised why I had left it in the first place - it was a nightmare to get right, particularly the balance between adequate shaping and a good level of detail. After much tinkering I settled on this design, which I'm happy with.

As usual for me, this build is in 1.5:1 scale and uses Hans-Pack as well as WorldEdit and debug stick.