Sine Truss and Fixing Mesh Holes

Hey all,

I was wondering I have been working on a definition but I can't seem to rectify an issue and I'm wondering if anyone has any ideas.

The idea is that two sine waves are braced to create a structure similar to a space grid. However when I try to create it, the shape does not sweep all the way, you can see the issue here:

http://www.grasshopper3d.com/forum/topics/sine-error

So to work around that I have recreated the geometry in Rhino to feed it into the definition, however I can't seem to join them or get the edges to line up still. (See .png)

I have attached the definitions for the application of the module and the generation of the modules. Can anyone see how you could work around this to create an object that does follow a surface, and how to get the edges to match to one another?

Thank you very much.

Sash