How to make this?(given in the link)....https://d2t1xqejof9utc.cloudfront.net/pictures/files/10546/large.jpg?1332899233
The design is simple...
two pads(extrusions) are enough.....
draw the rectangle (1) on any plane(front view) and pad as per the required dimension to both sides.
draw another section I_I (2) on the same plane(front view) and pad upto the required thickness,also to both sides.