UPDATE

sorry I’ve not been in the game the last two weeks but I’ve been very ill lately. My family has been kind enough to put me up in a holiday home to recover and with a bit of luck have recovered enough to continue this project.
That said, I’ve switched to my old but trusty laptop and of course had memory crashes with 3D Coat, so long story short I’m having to do retopology manually. The teeth and tongue will also have to be separate objects. Despite these problems, 3D Coat is actually allowing me to get away with things like topology whilst still working on the voxel sculpt. If anything, this project is giving me a crash course in “thinking quick on your feet” and simply making things work no matter what.
Many thanks to Roberto Ortiz, for once again, extending the deadline. Its very much appreciated.