Tamiya MF-01X extension to 257mm

This is extension of MF01X to 257mm wheelbase (as original extensions can be stacked only to 254mm), based on my early design. I modified it to include some space for electronics. Two halves are connected by pillars, which can be printed or replaced by some more rigid variant.

I included a jig for precise driling of a new driveshaft - it uses piece of teflon tube as lining to lead 2mm drill. It should fit very tightly around the shaft and is meant to be discarded after a single use.
Drawing for a new driveshaft is also included in thing files.

You'll need TL01 arms and 39mm dogbones to increase width from "M" size

Or you can use my design
with 45mm driveshafts for "MF01XXL" variant
https://www.thingiverse.com/thing:5049235

or long span suspension
https://www.thingiverse.com/thing:5049748

update: added pictures, modified models for better fit