OIC - yes, I knew he built a pair of stats - been to his linked site - he did a great job. Why am I considering Ripole? Same reason I'm considering all of the "origami" OB sub designs. Mainly, it looks like the smallest implementation. However, Danny says that because of the large unbraced panels, Ripoles are "buzz boxes"

Anyway, I may wind up with a W frame - more reading to do about DIYers' experiences with the various designs.