Surfacing question

Hello. I am making some surfacing blending and I want to make a for just like the picture shown. It’s like three suface blend together, and I was thinking is there other ways to build this kind of surface. Can anyone help me here? Thank you !

lawnmower.3dm (4.5 MB)

Hello - your existing surfaces do not have a very convenient relationship to one another to make a clean blend here -

See how the direction of the top surrface wants to dive into that area where the transition goes? The other two surfaces are not ideal but they have a direction that implies a simple convex surface there where as the top one would force that to be concave - kind of contradicting what the design says overall.

the top one , especially, needs to be cut way back it seems to me - so that you can put something together like this: