The Yellow Rose of Texas - Vox
I'm a sucker for old radio comedy.
On NFT, here's what I can contribute: the cabinet I use to veg clones in preparation for transfer to my larger closet is kind of a DWC/NFT hybrid. I want to be able to transfer the plants into the DWC buckets in the flowering chamber, but I don't have room for all of that in my little veg cabinet. So I have a shallow tray/reservoir that the net pots sit in, the bottoms of the pots just below the surface of the water--and the water is constantly exchanged with a larger external reservoir outside of the cabinet. Water is pumped up into one side of the tray, and spills out of a drain on the opposite side, into a return tube to the reservoir. The water is about 3" deep, so it's not exactly NFT and it's not exactly DWC. Works well for me. It is important to check the pH etc. every day--but they've been remarkably stable for me. A lot of my cabinet setups have been similar always-on designs with larger external reservoirs, and I've found that keeping water moving can help prevent a lot of problems.
The dead simplest hydro system is non-recovery drip in some kind of soilless mix. After that, for simplicity and reliability it's hard to beat F&D. DWC is still less complicated and failure prone than NFT. Aero, if you ask me, is the most troublesome. Hempy buckets have me mighty curious.
Yield is notoriously hard to predict. I think you can probably expect production on par with F&D or possibly a little better--assuming optimal conditions throughout. But of course, NFT is very sensitive and F&D is not.
What do you need? Plans for a system? To help you there it would be good to have some kind of idea how you want to lay it out, what kind of materials you had in mind, etc. NFT can be done as cheaply as a folded plastic sheeting with rockwool cubes sitting in it or you can do gutters as troughs, or PVC pipe with cutouts for net pots, etc.