One must be resourceful sometimes. I'm still thinking/pondering what to use for the batting and backing. Whatever I decide on will have to come out of my sewing room.
I do know how I will mark the silk for circle placement though: I will use a hera marker.
This is a piece of curved plastic that makes a crease mark on your fabric, and it's a good idea to use it on the thin silk. No pencils needed for grid placement markings!