I'm trying to work out how to construct a exterior patio wall. I originally was going to use block / stucco. City wants a footer. There's a tree in the way that will have roots affecting the footers. While trying to find the best way I came upon the thought about using framed out cement panels. Wall has max height of 4ft. Then just installing them as a regular fence panel. No footers and apparently, no permit reqd. Would it work?