Glad you could use the link. I was going for looks outside so I went with the mattress stitch. There is a ridge on the inside though. Perhaps you could consult the stitch section here to see what will give you a ridgeless seam.
I love to give homemade gifts... which one of my kids do you want?
Find our "Canadian Oddball Blanket KAL" on Ravelry as: OddballBlankets