You are near the target! Damned Corchet is not spleeping! :)
https://moiscript.weebly.com/uploads/3/9/3/8/3938813/boatm.3dm
Another method!
Make quads with any Cut Trim you want
Verify that all points of Start End curves are in the same x,y,z !!!
So I moved very few "end points" for be on the crossing curves!
You must have a grid of quads!
Sorry for the optic effect of the curves on the right part...look the neighbour shaded view for help eyes!

Here i have just add a curve at the Bottom deck
Some generative curves are created automatically by the Network function!