Line (curve)-surface technique

Hi all,

I am trying to generating a standard surface. File attached.

I am trying to keep all of my geometry generation in Grasshopper:

• can I have some guidance on combining the lines to a polyline or curve in grasshopper to rationalise the mirror statement or a better technique to manage the lines and the subsequent solid generation from an extrusion, when I try to capture the vertices, from the move instructions, in an intcurve or polyline command only the most recent point is included as a vertex

• I have struggled with vector translating a point in 3 dimensions rather, evident from my construction points in the model can this be more effectively achieved

• when generating point geometry, is it better to keep to lower order geometry ie. lines with the grasshopper interface rather than surfaces

• when baking from grasshopper can i layer the selected data import into Rhino

Its a steep learning curve

many thanks

Kenyon