I drove a Chunk at the Worlds... Sorry UK, MicroX 5.
Got to say that even with a bent chassis (my fault crashed it during installation laps
) the car is Awesome, amazingly planted and very easy to drive
only think you need other than a B4 is a dremel or similar!
Me and the chunk - The chassis bent when I hit the foot of theguy who is stood behind me - at full speed.
(*photos courtesy of John Howe)