I was told by a taxidermist that is commisioned to sell/produce replica mounts of the Hansen buck that the mold cost 3000K USD to make and then an additional amount dependant on the number of casts ordered (the price was based on quanities ordered). The cost for a Hansen Replica is 3500 USD.

Any way he explained fabricating a tine or such is easily done in house but having to make an entire rack required the mold and have it cast, ensuring it would be durable and correct. This process they go elsewhere and in their case order from a US company (not sure which one). I would guess you may be looking at needing the same thing, he mentioned they did the mold based on measurements and re-creating...never did they set hands on the original antlers. So I would say they could assume the other side was a mirror image and like any shed try to figure out the spread for the skull plate to be mounted. My guess the Hansen price was indicative to the value of the replica they reproduced, meaning a World Record! Just saying I am not sure if every mold or cast would cost such an amount as he mentioned.

A call to your taxidermist or a well known one in the area would surely give you a better idea of the process, possibility and cost involved.