I found/bought a trashed '85 Tri-Z a few days ago. I will post pic's as soon as I get it dug out of the guys garage (its really buried under junk) I will do a full restoration on it, as mostly stock. I will share the build on this forum topic.
His wife's kid owned it since new, wrecked it decades ago. Then died in some kind of accident. So its important to the family to see this trike restored.
I think the engine is solid and would run with a good clean up. But the major problem is the axle is bent at a 90 angle. I have a replacement on a shelf. Then I know it will need cables, and plastic, both of which isn't a big deal. Otherwise I think this will be a fun build.
(edit: for fact correction)