I wonder how hard it would be to lay out/cut dado's for a W frame .... If youlaid it out with a jig and used a router it might not be too difficult...

I'd think the dado's would help .
Also, double up the top & bottom panels like I did
My math comes out the same, rughly 226 "2 vs 150"2. I thought about going with 8's as well but after talking with Danny and looking at the cost difference, decided I might as well go with the 12's. I believe Danny now has the FR 08's in stock now so you could use those

-jay