Urgently need help creating a 3D object from surfaces in Grasshopper

I am new to Grasshopper and I am currently working on a project where I need to create a 3D file that can be exported into Revit. I have created a surface in my current .gh file and I need help on how to extrude or thicken it to create the 3D object. I have attached the .gh file and some images to help illustrate my issue.
I apologize in advance if my description of the issue is not clear enough. Any assistance would be greatly appreciated.
Thank you.

arch_midterm.gh (17.9 KB)

arch_midterm (1).gh (24.2 KB)
Use this.Need to install Peacock plugin.