Subframe Connectors, Torque Boxes & Inner Fender Braces

Isn't it pretty darn cool to drive after that?
Just the subframe connectors made a huge difference in the stability.
Especially over those multi angled surfaces.

Hint on the door regulators and control rods.
Use wheel bearing grease in the tracks, and cover those doorhandle and lock rods with plastic tubing.
Those two things will deaden a lot of little rattles.