I don't know why people want die cast parts on Mando figures. You can't see the joints so I am guessing people want die cast armor. The plastic bodies can't handle die cast armour that well over time.
I own all the diecast IM figures and the diecast is meaningless to me, i like the design more than the material they are made out of. I mean they are still 80% (give or take) plastic.