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I am not the author of these tools, that was done by another dev this past year, so I don't know all the internals of these tools as he does, so I can't really troubleshoot issues when they come up as he would be able to answer them more clearly. The above documentation provides at least a basic workflow of how to do this. You see the model is composed of not only the actual mesh in the blend file, but also JSON data that represents the location of the vertices and faces in 3D space so you would need to essentially build a new model and the tools we have in MB-Lab 1.7.8 CAN do this, it just would take a lot of work on your end to do so. To add new mesh to existing mesh would require quite a lot of work actually. I'm sorry for the late reply, I had a lot going on in my personal life.
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