How to create a complex corner surface, to fill the space I have?

I would like to create a surface in between the six surfaces shown.

I would like tangency or continuity to surfaces 4,5, and 6 but position only with surfaces 1,2, and 3. What is the best way to go about this?

I have tried to patch the area but the patch will then not join with the other surfaces afterwards.

241126_rhino help.3dm (259.1 KB)