Root Spacing Issue (NTF Fence Post System)

Another noob question here.

I wanna build a NTF system useing those 5"x5" fence posts from homedepot/lowes. Just a small setup for 4-6 clones under a 400-600w light. I figured a NTF system would be lower maintenance because you don't gotta worry about misters/drippers clogging up with nutrients.

I figured on the 3.5" net pots because they fit nicely in the fencepost. Is this large enough? Is the small 5" tube viable for a clones root system?

I was also tossing around the idea of adding a nuebalizer (Fogger) in a separate resevoir (so the water in the fencepost won't heat up) and run a intake to the fencepost for the fog to roll in. Then I can have a dual NTF/Fogger system that in theory should speed up the flowering process.

Comments Concerns? About how much space should I allow between each pot so they don't compete with eachother?