P.S.
A. I usually remove the paper. If one used washable glue, a quick soak/rinse in water will make it easy to remove.
B1. Draw the seam lines. Lead pencil or Sharpie type marker works.
B2. I also mark "base" on the center triangle of the unit.
C. Add sandpaper dots to the backs of the templates. The dots help keep the templates in place while cutting around them.
D. On this unit, I did cut off about half an inch of the skinny tail on triangles B and C. I still prefer to leave about 1/2 inch seam allowance on that tail. It's easier for me to handle it while sewing it to the A triangle- but I can't give a "logical" reason why that is so.
It does not take that long to make templates - and one can make them any size that one wants.
Another tutorial for making your own templates is here:
How to make plastic templates