May be you have this figured out by now but I will post the pictures of what I am doing for others.
Draw 1" lines:
[ATTACH=CONFIG]500597[/ATTACH]
lay 60 degree ruler on line and draw lines across:
[ATTACH=CONFIG]500598[/ATTACH]
You get something like this:
[ATTACH=CONFIG]500599[/ATTACH]
Cut around diamonds with as much seam allowance as you want:
[ATTACH=CONFIG]500601[/ATTACH]
Hope this is helpful for when you don't have paper templates.
I made a few card stock templates to use for when I make the folds.
peace