https://playground.babylonjs.com/#7S3ZHU#1
For some reason I cant get the cut out sections of the CSG to be be taken into account with the mesh imposter?
I know nothing about physics engine, but if you use AmmoJSPlugin instead of OimoJSPlugin it does work:
https://playground.babylonjs.com/#7S3ZHU#2
Maybe MeshImpostor is not supported by Oimo?
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Oimo’s mesh impostor falls back to a box impostor, as oimo doesn’t support mesh impostors. You are totally right 
Both cannon and ammo will work correctly.
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Crazy I had used Ammo initially and it was falling through the mesh.