After searching repeatedly for just the perfect curve for a new size fabric piece, even going to the barn to borrow a garbage can lid, using a pizza pan, a saucer or the microwave plate I finally got smart! Got some of the sheet template plastic (so worth the extra pennies, doesn't curl, heavier plastic) and traced different curved objects on it.
You can make tons from just one sheet by nesting them so that the inside curve is smaller than the outside. Boy, has this worked wonderfully especially for this quilt with its many curve sizes needed!
All from one 8 x 11 sheet
This one will work!