Since mato mart doesn't have stock, try Taigen. Erik takes care of RCU customers pretty well.
Taigen tanks are more expensive than henglongs but they overall are much better tanks and most have metal lower hulls and some have metal turrets.
Check them out.

In the model train world Im a rivet counter, and we get a bad rap for being snooty to not so accurate modelers but I try to keep my snootiness under control.