If you want to make a bracer, but want the lacing to be on the side, instead of the bottom, follow the original directions, and draft your pattern, and cut it out out of paper.
Then tape it shut over your arm. With a marker, draw a line where you want the new opening/lacing to be. Then cut along the markered line, and lay it flat, this is your new pattern.
It will look something like this.
Remember this when you are sewing them together, as when they are sidelaced, there will be a right bracer, and a left bracer.