[Kevan]

Currently printing a two piece chassis for the 3D printed Mercedes W165, the design is along the lines of the red Lotus 25 which goes really well. 
I intend using one of the tungsten TIG rods you see glued to the chassis next to the W165. 
Rear axle will be ballraced like the current setup. 

New chassis feels much better.

There's a centre pivot which is 2.4mm tungsten TIG rod and a couple of pieces of the same rod either side of the pivot.  Tungsten is denser than lead.

   

This is to CSCRA regs for Voiturettes and that guide doesn't protrude past the front of the bodyshell.