Sorry Garslag about missing this question
What is the purpose of the rod from the handlebars to the front wheel?
too busy kicking myself for not thinking of using the trukk boarding plank hooks for PK fingers - I've even got two boarding planks on my workbench
That is a steering arm Garslag (look up elf racing motorcycles online).
and thanks to Giga for stepping up with the answer - hub centre steering on bikes has been around for a while now, admittedly the 'gearing' is a bit extreme (half an inch of movement at the grip would likely be at least an inch/inch and a half at the other end of the bar which would translate to about 30o or more at the front wheel ) but with all the mass of the trukk engine and the warboss, persuading the bike to change direction of travel would probably involve some pretty radical counter-steering
P.S. About that "most ludicrously oversized WaaghBanna", Carnival was over a week and a half ago Badfang.
They're Speed Freeks - they're not late for the last one, they're just really early for the next one