How to thicken the surface(Edge surface) in Grasshopper

I used triangular panel in Lunchbox --> control point --> connect the edge surface to the point, but it could not be offset to become solid.

First part

Second part

It will be useful if you provide the Grasshopper file. It becomes very difficult for people to respond otherwise.

Refer this:

Sorry about that!
Here is it.

surface (32.4 KB) surface pattern_1.3dm (2.6 MB)

Thank you for your help! But it does not become a solid, but a offset plane.

You can now loft these two surfaces to get a solid.

Oh Thank you!
After I tried to replace the of move command by the extrude command, it works!