FWIW, the DD describes starlane entrance points as being ellipses. You have them here as polar grid squares.
In the light of the recent commits, I'd like to see this clarified. An elliptical entrance zone would intersect with the combat area. Is this a good idea? Shouldn't it be separate, an extension, where only incoming ships can be placed?
I agree that the entrance/exit zone of a starlane should be distinct from the combat area. I don't think you should be able to "park" ships in it. This can however be achieved with a lane entrance/exit of any shape.
A full ellipse is sorta awkward however, since there would be odd little corners behind the ellipse that was still in the system's radius. If it's elliptical, I'd like to see the entrance zone flush against the edge of the system bounding edge. Like this:
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Though we want to make sure we don't have planet's sweeping through the starlane entrance.
Though i really don't remember any particular reason the ellipse was decreed as the shape. It seems like the kind of implementation detail that the DD are supposed to avoid-- unless there is some good reason i don't recall. What PD has in his mockup seem more straightforward to me.