Diagrid Help

I'm having issues with trying to design a diagrid for this model surface. I have attached a .pdf and .jpg image of the draped surface.

1. I used a "draped surface" to design the surface for the diagrid definition and then trimmed it to my desired specifications. However, the definitions I've found don't confine themselves to the parameters of the surface, they continue to the extents of original untrimmed surface. Is there a definition that will confine themselves and "fit" to the parameters of this newly edited surface?

2. I am trying to get a diagrid that will bake only the structural grid of the diagrid and then the glass component separately. I will be rendering this later and I need both components to be distinct of one another.

Please help, I am running out of time, I have been freaking out trying to figure this out and I have found nothing that helps my project. I've searched and found different definitions, tampered with them to fit my project and yet to no avail.

I am still learning this plug-in and I enjoy it's functions, PLEASE HELP!!!

Thanks,

Sim