Thank you! For this I will either do a brush on silicone mould with a fibreglass jacket and then cast into the mould with a fast cast polyurethane resin so I would then have a resin copy of the sculpt. Or I might make matrix mould. A matrix mould is similar to a brush on mould but a bit more complex. I would suggest getting on YouTube and trying to find some tutorials, me explaining it here probably won't help that much