>> Now, sure, if your window is rectangular, the push/pull tool makes it 
>> easy enough to continue. But what if you made a *circular* window? Or 
>> some even more complex shape?...
> 
> ...you need to get a proper 3D CAD program? :-)

Yeah, figures.

Although, as I said, I've used a lot of 3D editors, and SketchUp is at 
least the first one good enough to make nontrivial objects with. I 
suppose that's something. (It *really* annoys me that it can't do real 
curves though...)

> Can you not edit the vertex positions of the hole?  I would say in 
> Blender just select the vertices or edges of the hole and then 
> translate/scale them - I can't believe the same isn't possible in even a 
> very basic 3D tool.

Oh, you *can* move the individual points or edges around if you like. 
But if your surface is particularly complicated, this becomes 
intractably difficult extremely fast. Nowhere near as easy as just 
moving the shape around before you make the cut.

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