Rhino Grasshopper - Patched Surfaces not being closed

Hey, I’m creating this roof structure and the underlayer of the roof is this complicated curved roof which starts from arcs and all ends up on one point. I used the mesh tool to create these surfaces but now when I try and brep join the 4 meshes they won’t work and I can’t make one final brep.

Below is a photo, it’s the underside surfaces which are all heading towards he centre which I’m having an issue with

Hey Sam, welcome to the forum!

When asking questions about Grasshopper, it is always a good idea to add your gh file, or a part of it that is giving problems. Remember to internalize any geometry, and ideally not use any third party plug-ins, so that others can open the file and help you.

Underside Surface not working.gh (7.1 MB)

The rhino file is kinda chaos, but there’s a main brep with everything that I’m trying to join together to make into one closed brep there. Just thought if how I made stuff might be useful