Fourth quilt? Really you did a fantastic job on it, and I like the fabrics you chose with the unusual yellow and orange. I would check the batting I was going to use to see how far apart you can quilt, then I would stitch diagonal lines, intersecting between the yellow and orange along the block's lines, with the cross-hatching as this is a more modern quilt. It's also a lot easier to quilt that way, you can do half the quilt, then turn and do the other half without too much of the quilt being bunched up under the harp of your machine. I might use a cable for the borders, and you can get the rolls of pre-marked paper that has an adhesive edge to help it stick to the quilt. I've used those rolls on a number of quilts and I'm always pleased with the results. Great quilt. I might use a dark grey thread, or a unique variegated rayon thread for the quilting.