The drivetrain is pretty conventional using off-the-shelf components. Front axle is your basic Tamiya type passive, and yes, that means I'm mixing ~1:14 manufactured and ~1:12 printed parts, but I don't think it's noticeable to the naked eye. (If you're breaking out the ruler or calipers to my builds I've got bigger issues =)) Rear axles are from Integy, a type I've used on other builds. They're a bit blocky, but I like that the parts are interchangeable, ie the through axle is the same as the end axle, just with a blank diff cover instead of one with an output in it. Same for the steering axles, so for my 10x10 HEMMT I had two steer axles in the front plus one in the back. All the same axle means designing the suspension is easier.
Front suspension is leafspring, using the Chinesium "D90" springs as I had some on hand. Rear suspension is linked, which always annoys me and yeah, maybe I shoulda done airbags, but the axles come with links. Did require custom link lengths, but was able to print new center tubes and reuse the rod ends. Getting the link lengths right always drives me nuts, and this build was no exception. I really shoulda done leaves or leaf+links like the Lesu pre-made box, but the Integy kit came with all these links so it's another "How hard can it be?" moment.
The rear driveshaft was a nightmare; ended up just sleeving some square brass tube inside U-joints. Soldered the ends of the tubes so they didn't squish under the setscrews.
Also always seems painful to find shocks which have enough rebound for my taste but fit into the desired space. Both front and rear use Chinesium shocks, but with new much stronger springs on/in them. (Particularly in the rear as I know that's a horrible shock angle, but again, getting everything to fit was a major pain in the watoosi.)