Slim93: Thanks for the heads up but before we say yay or nay I'd like to hear from people who have has those lights as to how well they work. It would also be good to know their dimensions, how many watts of current they draw, etc. There are a lot of ways to go nowadays and that looks pretty good.
I tried a couple of curly CFL's last year and they were okay but I still like my T-5s better. If you're looking for lighting I might suggest a 4' long rack fixture of four tubes of T-5's cost a little less than that at my local hydro stores and a fixture only 2' long is quite a bit cheaper. How big of a grow area do you want to illuminate?
Another thing to consider is that sometimes doing it your self is more trouble than it's worth unless you have access to some pretty sophisticated machinery and equipment. For a project like that made out of what looks like stainless steel reflective sheet metal it takes a sheet metal brake to get accurate bends on the reflector, and how much are you going to bend it? An adjustable aircraft instrument panel circle cutter for the insertion of the sockets would come in handy too. Otherwise a project like can really look home made like it was done by a bunch of redneck engineers.
The design does look reasonable compared to some others I've seen. I guess it just comes down to what's your time worth? HSA