... I can't seem to enter any text after the pictures, so anyhow:
I'm hoping that if I tie the existing rear transaxle hanger back to the frame near the pivot point of the banana arms, it'll stiffen things up enough to eliminate the need for the elaborate rear mount set-up I made (at great time and expense).
Only the front mount will be urethane, and it's sandwiched by bolts (not using the mount as the hanger-point, only as an vibration isolater). The rear transaxle mounts will be the CB rhino-mounts.
It might work, it might not. That's what you get at this level of play.