I just want to say to be very careful with all the marking tools on the market today. Not all come out. Especially yellows and reds. I know people have had problems with those rolling wheels ones and some of the chalk ones (if they contain any type of wax). Be sure to test on your fabrics - it'd be a shame to bleach some of the blacks. I actually had that happen on a dark green XMas quilt using a chalk tool that was supposedly made for quilting...but when left on more than 2 weeks, it bleached out everywhere I had a line!
It's gonna be a beautiful quilt! Can't wait to see it quilted :)