Just FYI here the just under 1/2 inch osb was 10.40ish and the just over half inch osb was 14.47 so maybe not that much but still enough to make me go with thinner around but on top I have to admit that I still wanted thicker wood after standing at the store and looking at it all.
If it were me, I would go ahead and use 3/4. You probably dont need it but its not that much more expensive and if your going to do it,why not over do it. Looking great so far, cant wait to see the finished product.








