I'm about to build two 60' long by 3.5' tall stone walls. I'm using 3" - 5" thick brown rubble. The included picture is of another wall I did using the same stone. The hieght of the wall in the picture is only about 2' at the heighest. My question is: Do you think I can I get away with making this a dry stack wall? The stone I'm using will be anywhere from 10" to 20" deep and 10" to 20" long, in addition to the 3"-5" thick. I will backfill with 1/2" gravel six inches behind the wall and will also baffle the wall about 1"-2" for every foot of height. For the stones at the top of the wall, I always select larger stones that will hold up to foot traffic should there be any. If I don't dry stack, I'll have a 4"-5" cement footing and butter up the back 1/3 of the stone. What do you guys think? Any thoughts will be appreciated.