The trans cases are few and far between, and way overpriced when you do catch one on ebay.
You don't want aluminum arms on a Jato. They will get bent, and likely do damage to the bulkheads. Grab some RPM arms.
And stay far away from the junk Traxxas aluminum links. They are worthless.
Uprights/c-hubs is a good one. Shocks as well. I'd keep the plastic rear shock tower because the aluminum one I am sure is what caused my transmission case failure. There's really not much available for them in aluminum unless you can find a transmission housing.
The toe is set with the steering links. So those numbers will get you in the ballpark.
For the camber, just use a square to get the wheel straight then set your link to that and adjust the camber from there.