I'm still figuring out the dahlia center and know the center is going to be a mess. I forgot that you need to "halve" the section in two and sew down the middle for an even seam. However; sixteen pieces meeting perfectly in the center isn't aligning well.
I'm going to have to email a couple of quilting experts to see if there's a way to work this out. If this isn't going to work, I thought about making the center one piece, adding the seam allowance and carefully working my way around the center. Then I worry about the probability of stretched biases.
I'll figure it out. Eventually. Or cheat and fuse something for the center with some applique work. It's 2009. Cheating is allowed now.