Think I've figured out the problems above!
The normals/overlapping faces is still present with the wall that I have remodeled using splines/sweep to avoid cap holes issue.
Retopo'd wall portion wireframe https://i.imgur.com/3TGkamW.png
Tyflow wall wireframe https://i.imgur.com/dlPdDz1.png
Render of Tyflow wall https://i.imgur.com/mSrS0aW.png
edit1: I'm able to partially resolve the above by unticking 'Optimize slice borders', but this creates other issues with geometry sticking through the wall instead of creating odd normals
edit2: voronoi fracture doesn't seem to transfer vertex colors when it performs 'cap holes' on geometry. In my case I use vertex colors for additional coloring, so it renders black when there are no vertex colors present. I'm not sure how to resolve this.
The normals/overlapping faces is still present with the wall that I have remodeled using splines/sweep to avoid cap holes issue.
Retopo'd wall portion wireframe https://i.imgur.com/3TGkamW.png
Tyflow wall wireframe https://i.imgur.com/dlPdDz1.png
Render of Tyflow wall https://i.imgur.com/mSrS0aW.png
edit1: I'm able to partially resolve the above by unticking 'Optimize slice borders', but this creates other issues with geometry sticking through the wall instead of creating odd normals
edit2: voronoi fracture doesn't seem to transfer vertex colors when it performs 'cap holes' on geometry. In my case I use vertex colors for additional coloring, so it renders black when there are no vertex colors present. I'm not sure how to resolve this.