Multipple Brep trim Help

Hallo everybody!

I need a help trimming multiple Breps.

What i want to achieve is, profiling multiple curves within a grid (see images below).

I have tried multiple sweeping etc, but i have failed (obviously). The profiles should be "meet" at the nodes producing kind of miter joint.

What i did, is simply extrude a square profile (it should  be any profile) along my curves, scale them, so that they intersect each other.

After that, i have created an extruded surface at the intersection points of the Breps, o be able to trim my Breps with these surfaces.

Now, i am "stucked" at this point, i have been trying, but it works partially or not............

I really appreciate any suggestions or directions or solutions.................

Thank You in advance