Creating CAD-style front-, side- and topview

I am trying to create sort of a simple CAD like program that displays the world in a top-, front and sideview. I am using the PARALLEL_PROJECTION policy for my view and the front view is working like expected. I moved it 1000 in the +z direction and it is showing my simple test scene which is placed near the origin in a non-perspective way.
I have some trouble with side and top view though.
I want to create the sideview by moving the view 1000 units in the +x direction (to the right) and rotating the camera to point at the origin. This should be accomplished by using rotY(Math.PI) on the transformation for the side view, shouldn't it? That should rotate the camera 90� counter-clockwise around the Y-axis (which points up, right?).
But my scene doesn't show up.
Same thing for the top view (moved it 1000 in +y, rotX(-Math.PI) ).
Any idea why nothing shows up?
Could it be a problem with the rotation precision? It appears that parallel-projection is rather sensitive to roation, rotating by something like 0.01d on my front view lets the scene disappear aswell.

I think you should first rotate and then translate, since the order of matrix operation is sensitive.

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