I've broken both billet and forged cranks. If I was building a 10mm motor, I'd use forged.
If you're building in OEM cases, both will break the cases if it lets go.
I have a billet basket with gear and everything ready to go if interested. A couple of the arms have a little wear, but most have none. Kind of weird actually. Cushions are good. $120 shipped
There should be no play between drive gear and basket. The cushions are gone. It's not far from catastrophic failure.
As least buy a good used basket with no cushion wear.