An attempt was made to offset or shell patch P0, and gyroid boundary patch.

It appears that the "symmetry" operations have resulted in Flip of some surface normals, as some patches offset or shell in opposite directions.
Also P1 and P2 offset or shell with a little wiggle near a corner.

PatchPO Shell Centerline, 0.02, works very well. Node creation from PatchPO Shell slolid to the boundary patch with 12 solids looks good.
Boolean union two of the 12 solid patches has not worked. But hiding two skins and deleting the two surfaces in common, does permit two solid patches to boolean.

A few stray curve segments were created a some time...

- Brian