Hi,
As the corner Segment isn't symmetrical and needs to be mirrored, I would suggest you to pick the "corresponding one" by the
Selector Operator in the
Spline Mat ID mode. In attached possible solution vertical lines have the
ID 1 assigned and horizontal lines
ID 2.
Segments in attached style are using the
Pivot Alignment and the precise placement is handled by using an empty Segment with
Left &
Right Padding values corresponding to corner Segment measurements.
Hope you'll find it useful.
Best regards,