I did it and was quit pleased with the results. It was my first attempt at modelling, so cut me some slack.
I did the following to make it work:
cut off his cloth tabard between his legs.
replaced his twin shoota arm with a biker arm.
covered the arm up with decorative spiky stuff to hide how weedy it was.
Added some extra auto cannons to make his dakka more dakkier.
Canted the steering wheel so it was pointed to his right.
The bike is leaning so the bike and his left foot make a tripod of sorts.
Lastly, I put him on a large base and used some of the base kit to spice it up.