How to union multiple plane surfaces

[netsonicyxf]

1.gh (28.4 KB)

[HS_Kim]

1_re_01.gh (31.7 KB)

[netsonicyxf]

Some shapes are updated. After “join curves” they contains some “Invalid Curve”, I tried to remove these curves and use your method, but still failed.
1.gh (37.7 KB)

[naguko.studio (naguko)]

you flattened the tree after extracting the brep edge instead after joining the surfaces edges,
It is actually trying to connect overlapping lines that cause the invalid edges.