I would spray baste with 505 and keep quilting as simple as possible. I wouldn't try to FMQ with it, and a pantograph might even be too much as you want to keep lines as far apart as the batting allows. The baby quilts I have seen made with minky had simple straight lines going across the least stretchy direction. Really, minky is so pleasing on its own it doesn't need a lot of quilting. This is one time when less is more!