I recall, back from my days with the Charger, when TommyZ's was doing a lot of the engine hoods and grilles for the MOPAR crowds.
I think, and don't quote me on this, but he was like 50/50 on completing orders.
Similar circumstances as described by the OP here.....
My patience would be pressed as well. Seems that stopping payment (in w/e form that entails.... CC claim, PayPal dispute, etc.) would be a fairly good "motivating" tool to light the fire under that vendor's butt so to speak, to get them to fulfill the order.
There's always the 'ol filing a BBB dispute as well, but results on that are somewhat iffy.
Sure is too bad that Mobsteel sold the molds off in retrospect, cuz Adam Genei and the whole crew over there (at Mobsteel) were top notch folks.
Sorry to hear all the nonsense you're going through.