shoulder pad notes

What is the make-up of a shoulder pad? How should it be fitted in or sewn in? The shoulder pad gives new shape to the jacket but this shape can be amended. That is what I am trying to do with a new shoulder pad that i am thinking of designing.

I see on the site below how to make up a shoulder pad:
http://www.fittingtips.com/classes/Class-ShoulderPad.htm

On this site the size of the shoulder pad is a semi-circle and for My shoulder pad, I am wondering if this is a suitable size. My shoulder pad would have more shape as my articles say; my pad wouldn't be uniform like this semi-circular pad- but there would be appropriate width and height, maybe you can say girth (the shoulder pad is 3d) at the shoulder neck point and this would then expand or diverge out to the shoulder tip.

My shoulder pad aims to have a better fit than a typical semi-circular shoulder pad. This shoulder pad is too uniform in shape. It pads up the shoulder but my shoulder pad wouldn't be a semi-circle or there wouldn't be so much padding because as I said, I was thinking of the shoulder pad for use in shirts and this new shoulder pad would have less padding mainly 1) because it would diverge out ; it would start at the shoulder neck but there would be minimal padding here and then the padding would 'develop' and then the padding would have a suitable size at all points of the shoulder line. How the shoulder pad gains width and height and size at different levels along the shoulder line is important.

Again I return to the purpose of the pad. It is to 1) give padding but 2) there would be more shape to the pad..and thus suitable materials are important...The materials such as fusuble fleece may be suitable but my pad, i think, would be covered; maybe fusible fleece is too thick a material..

Instead then of my pad being semi-circular , it would have lines diverging out on both sides of the shoulder lines. The distance from the shoulder line may be an important variable. And at the shoulder tip, there would be the maximum distance and then at the shoulder neck point, minimal distance.

Some type of contoured shoulder pad is the best..maybe