Exactly! Better to make, if any, mistakes in the beginning. Of course you'd want to live in the country, have a big ap-system and have a few fish and salads a week right away...
But if a system like that would fail I guess I could lose interest, and a lot of money... :P

Will start small and work my way up. If it goes well I could just by another setup just like it and run them side by side for some experimentation.

Would you change anything from the setup I linked?

I'm thinking about cover the outside of the growbed with aluminumfoil to keep out the sunlight from the roots but haven't found anything else in the design that could be made better.