Surface transition difficulty


I’m having trouble with this surface transition. Here is the primary surface and what i’m trying to achieve.

I’m attempting to transition the 3 fillet edges into 1 whilst maintaining the large corner blends in between.

I’ve tried extending the four corner blend edges, trimming them back and filleting the edges but i’m not getting the result i’m looking for.

Here is the closest i got to what i’m looking for.

It would be extremely helpful if someone could give me some tips or a precedent file that deals with a similar situation.Thanks in advance!

Elbert, if you can upload the file people will be more likely to help.—-Mark