I freehanded my chapter badge by breaking it down into simple shapes, an idea unashamedly stolen from the warp. The image below demonstrates the process I used.
Starting with a vertical and horizontal line centred where I wanted the symbol, I then added the diagonal lines but made them shorter than the first two. Next I put in the two cross bars, one to make the guard on the sword and the other as a guide for the blade, after those I filled in the blade using the lines as guides to get it symmetrical. With the sword done I used the remaining lines to do the star points, notice that I join them to the sword. Finally I put the break between the sword and the star in using the original background colour.
There you have it, a complex chapter badge in 5 easy(ish) steps. Having done all that I may have found an alternative solution, I'll see how that goes and report back!