How do I make a blueprint that has 2 lanes of rails with walls and turrets?
When I try to make a blueprint like that, it spreads the turrets out really far and also, the corners don't get any walls!
Also, I use modded substations, but that part seems to work fine.

Anything but walls and tiles are only placed whenever a pole is placed. So far a line of turrets you have to inlude all the turrets that fit in the area of the substation, something like this:

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Curves not having walls/turrets is expected, since i haven't gotten around to adding blueprints for curves