Please help! I need to create a joint for merge 2 mesh

Hi guys! I am actually in trouble with my grassoppher file. I want to create a joint for 2 complementary meshes that I create after the voronoi tasselation!
The pic is down there!
Let me know

Please help me!

If you want someone to help you on this forum, attach your gh file please

tesitutorefinale.3dm (3.3 MB) (87.4 KB)