cropping, lengths listing, finding a curve and its use

hello all.
I am a new user Grasshopper and need some help. This is the sculpture on the wall. Parametric curves are extruded along the Y axis Then I trimmed it with extruded loft. We got a 3D sculpture. But I need to Grasshoper found the smallest, longest, and mean length of each element (Y direction). ....... Then I imagine that grasshopper creates a plane of the points. new plane pulled cropping the original plastic (flat cut) and last thing- I need to wrote middle curve length (y direction) - this I have prepared but writes that all numbers in all the points of each other. : / Thank you very very very much