Givio, your fabrics are beautiful! That is going to be a gorgeous quilt.
A quick way to do triangles... ? The instructions I'm following have you cut bigger squares and then cut them diagonally, twice and sew the quarter square triangles back together. If you have a triangle tool (small ruler) that you can cut with, you might get it a lot more accurate than the 'cut diagonally twice' method. That's usually the case for me.
I haven't worked on my quilt today and haven't yet started the hourglass units. Yours look wonderful!