<<The only issue I run into with nearly every model is Non-Manifold geometry, because the 3d software has issues with some of the topology that Moi exports. Would be really nice to know how to solve these issues on the MOI side.>>

I know those issues all too well, hence the intermediate voxelization and final remeshing on file Import into the scuplt room of 3D coat.
Sure it‘s a Moi-3D Coat specific issue and mostly arising with thin and tiny objects.
…

In the light of the subject, you might also be interested in reading these export tips I posted for ZBrush:

http://moi3d.com/forum/index.php?webtag=MOI&msg=10364.13

Thanks, Metin !

Here's the final result, famous El Alamein Station, Egypt, Western Desert, mid-1942.

A somewhat peaceful desert evening mood, kind of Edward Hopper style drawing .-)













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Very painterly atmosphere, great work!