Is this possible to implement?
This would be a great way to slow down or halt enemy advances.
Either by them being a building at low cost and low tactial points requirements or as a capship ability.
That way you could even use it to cover your retreats.
If it would do damage depending on ship size it would be awesome: larger ships are toasted if they attempt to fly through, while smaller craft can pass relatively unharmed.
Also it being cloaked and for example only being visible for scouts would be cool.
That way you would some reconissaince in the later game phases aswell.