I think I'm going to use Jaba's second option, the one that sort of looks like a chain, mainly because it will fit and it looks like I can make a little bit bigger seam without losing points in order to squeeze it into 42 (not 42.5) inches. But...I was also thinking that I've using only 4" blocks so far and maybe it would be good to put in a 6" in order to "mix it up" a bit, design wise. Any thoughts on that, Brat and Jaba? What have you found in your RRs?