This is my entry for the we are not worthy competition. It will be a shrine of/place of worship to/effigy of Mork (or possibly Gork).
Fluffwise...A ruzzbot/stompa was abandoned by it's previous owners, possibly due to a total ork genocide at the hands of space marines.
As the spores that where left behind came to live and hathed/birthed new orks, the young/feral ork tribe started exploring their surroundings. On one of those explorations they came across a large hulking structure, which they claimed to be a effigy of Mork (or possibly Gork). They build their new camp around it and started to worship the structure bestowing as much skulls and trophies on it as they could, in the hopes that their hunting parties/raids and other orkish activities would be blessed by their god(s)...yay
At first it may look like i am just building a Ruzzbot/Stompa, but bear with me on this one
I bought a converted skullhamma based on a baneblade
iirc, which was in poor condition from the internet, ripped of all the parts and started rebuilding it.
Keeping the hull for it's base and the mainturret for it's head.