I have tried just about every method before tossing together my 21st Century F & D from parts on hand; Air Pots + lava rock + lp pump+ outboard rez + pvc + Rubbermaid tote + a few fittings. This system allows for flexibility to maneuver the plants, as well as the convenience of an outboard rez. As I am a small user, my rez is < 5g; dumping and replacing with fresh nutes is easy.
I had 2 plants growing in my F & D; one a clone of the mother that was in mid flower, the other is an F1 cross from that mother. The cross overtook the tray and space under the light, forcing me to finish the clone elsewhere. I quickly tossed together a hydro-bucket + bubbler rig, using a round wash bucket ( ~15 X 7). I put 4 large Oxystones on theirs sides in the bottom, covered them with a larger AP bottom (looks like a grate) and placed the clone (which is in a 1G AP) on top.
I added nutes to ~ 3" above the bottom of the AP. Total nutes ~ 1.5g: it has been working great, and I haven't bothered to keep the light out of the nutes, with zero algae growth. I change the nutes every 5-7 days. I supplement by feeding from the top using a meat baster, to keep any roots above the water line from drying out. It's simple and highly effective. Pics in my journal
Taking a page from hpa, roots perform best when fed small amounts followed by a dry period. HPA roots are the epitome of efficiency (see photo in my journal). When their environment is right each root develops thousands of fish bones AND upon those fish bones, tiny root hairs (think pipe cleaner fuzzies) to capture and absorb the atomized mist feedings.
Every DWC/NFT root mass I have ever seen looks like swollen spaghetti, which is the least efficient root for feeding the plant: it is also most susceptible to root rot and nute lock out. And yet, plenty of people use it and seem to have successful grows. That said, I see the most cries for help from DWC/NFT growers. Personally, I like to minimize potential problems.
It has taken me 5+ grows to get a functioning hpa system, but only because I challenged myself to achieve similar results to true hpa growers who use an accumulator + solenoids + deep cycle timers capable of < 0.5 second bursts to feed. Their systems are a lot more complex (and expensive) than I want to do