I've had this badly-built Valkyrie model that I got from my LGS second hand for about a year now. I never play with it, and have been trying to get the model apart so I could use the cockpit/wings for a Vulture conversion.
Well, I finally decided what I wanted to do with the rest of the model: build an Ork battlewagon for my slowly-building Waagh of kunnin' boyz. The theme of these Boyz is that some particularly kunnin' boy noticed that the Cadian 'umies get a lot of fighting done. In proper cargo cult fashion, he concluded that if his boyz looked more like the 'umies gear, they'd get more fightin themselves! The alternate explanation I had was a group of orks who have somehow managed to live long enough on Cadia to "go native"
I happened across a trio of similarly-built Sentinels for $35USD at the same LGS and an idea struck me -- I could use the main body of the Sentinel for the cab. One thing led to another and, well...
The final design concept here is to set it up like a "pony cart" with the sentinel chained up. Some 3d printed small tread sections (think of the FW minelayer for size/shape here). I've got a boy set up with a steering wheel in one hand (raised in the air).