Here's the Tute I used when I made my first 2nd 3rd and 4th lonestar quilt.
You still have bias edges and need to be careful but not nearly as careful as you would if you cut each diamond seperately.
I had next to no stretching if I was careful and I didn't use any starch at all.
http://www.angelfire.com/va3/jclane/.../LoneStar.html