Create one surface

it’s possible to create one single continuous surface?

one surface.3dm (268.1 KB)

which surfaces should be one? the two on the sides are actually elevating, is bottom part a cealing and the others parts of a floor? for the elevating ones you can use MergeSrf.

I need to create a ramp approximating the surfaces with the borders fixed. The best solution I found until now is using the borders and the patch command with hi-resolution and 0.1 stiffness.