Maybe the people who are having no success with neem oil are not using it correctly. I dont know it just a though. ... For me neem worked great... I also think its important to feed the plant well and supplement with something like seaweed extract.
The roots will drink, they will grow, the water will be reduced.... Rule of thumb. Mix your solution. Top until an inch or two of the roots are submerged in the bubbling solution. The rest of the roots will hang above the solution in the air.
I havent done a dwc in a couple of years. This...
The box itself looks ok as a start but like everyone said ... Ventilation in/out is essential.
then.
Think about maximising the use of floor space in the box. consider either a wider pot of small tub for the base of the box. or maybe even a small bubbler setup.
either way you'll need to be a lot...
Dont know about karma but if peeps know youre generous then eventually you'll have it come back round to you. Well thats the theory I live by ... LOL I'm still waiting.