Need help with creating Y-ish shaped ramp

Hello Rhino community,
I need some urgent help with modelling an irregular ramp. I uploaded photos of what the ramp looks like and a plan view. Any help would be greatly appreciated.

Hi William - it would be easier to help with a model in hand so we don’t have to invent what we think you are asking about - can you export and post the part of the model that you are asking about?