Struggling to loft rectangles to each other

Screenshot by Lightshot (what I have so far)
Screenshot by Lightshot (grasshopper code)
Screenshot by Lightshot (the rendered mass I am trying to replicate)

I am trying to recreate the rendered mass within the screenshot of rhino through grasshopper. I have created both the top and bottom rectangles (as well as offset them to allow it to become 3D and give it thickness) needed in order to loft the shape, but I am struggling to loft the surfaces in grasshopper as well as filleting the new mass from grasshopper to recreate it.


You can fully parametrize the model like this:

Also you can directly upload images, videos, and files here. There’s no need to use an external service, as long as your files don’t overshoot a certain size. (256.0 KB)

Thank you so much!