This is awesome information. I'd like to build a 1/35 scale (or smaller) TTTT and plan on fabricating most of my own parts. my first attempt will most likely have a simple shaft wo a RWD worm gear, front steering, and articulation on both axles. Seeing your ideas is very motivating.

The idea of using small brass tubes for U-jounts is ingenious! That really opens up the possibilities... What do you use for the spindle block, just a small brass block with a couple pressed pins?

I assume most of your fabrication is done with small hand files and tiny fingertip drills.