I was also a little concerned with it not been able to hold the weight when I saw the design so I modified mine a little the pipes and pots sit on there own bench and the tank and
pump sits on the ground at one end and the pipes feed into it.Fingers crossed it will work but it sounds like its fun experimenting with all the different types on Hydroponic set ups and growing different plants.
I had a look at your set up Gps Frontier and it look very impressive.