Intamin and RCT Loser share my opinion. When I recreated Mamba, I used steel looping because:
1) It is no where near Intamin's designs
2) Corkscrew track is still different and the cars aren't anywhere close.
3) Steel looping of Schwarzkopf is most practical and accurate to Morgan design.
I'd say use Steel looping [;)]
Plus, in
this pic of SD2000, you can see it most resembles the look of Schwarzkopf. (Even though Morgan's track was re-designed for SD2000.)