Ed, I think you made the "right" choice on the off-set position of the plane nose. In this case, it's less relevant on the back side of the scene. Like you, I think the sides of the scene should all be on the same plane - sort of "sliced" off. Even if an asymmetrical base is used to enhance the scene, the cuts should be uniform, I think.
The biggest issue, I would think, is that the wedgie shouldn't detract from one's understanding of the scene. Otherwise, do the full scene.
Anyway, to come back to your piece, I really like it. Thanks for sharing it with us!