Transform a list of rectangles into surfaces and the extrude

Hey guys,

I have this code for random rectangles but now I want to transform the rectangles in surfaces and then extrude them, I tried with Nurbs and also with Brups but still getting errors. Any clue of what should I do?

Thankyou!!!!

//Create empty rectanles, breps list
List<Rectangle3d> rects = new List<Rectangle3d>();
List<Brep> collectBreps = new List<Brep>();

//Initialize a new instance of the Random class called random

Random random = new Random();

//Create a new unitZ vector
Vector3d unitZ = new Vector3d(0, 0, 1);

//Start a loop
for(int i = start; i <= end; i = i + 2) {
//Create random values
int randint = random.Next(0, 100);
int randint2 = random.Next(0, 10);
int randint3 = random.Next(0, 5);

//Create new Extrusions based on these random values
Point3d pt = new Point3d(i, randint, randint2);
Plane pln = new Plane(pt, unitZ);
Rectangle3d rect = new Rectangle3d(pln, randint3, randint3);

//Add all of these to the appropriate lists (Actually, since we are only using the rects you don't need the others FYI)

rects.Add(rect);
}
A = rects;