Thanks, i hope not too deep, maybe leave a couple/3 inches not filled? My thoughts was 11" not enough and the 10' 10 X 10's were a bit too heavy for me to work with so........... in my confusion :dizzy with what dimensional lumber to use it got about 4" higher than i really wanted so...... I hope not too deep? can always chainsaw off the top 2 X 6 but as i get older bending and reaching, might like it (67 now)..........