I use make and use these racks. They work fine. The PSU units get plenty of air. Google "OPEN CASE" there are plenty of other designs out there, if my design doesn't suit your needs.
Each one is build in my shop in OHIO. They ARE NOT mass produced and they are by no means PERFECT. each one is hand tooled and drilled and cut. each on contains minor scratches and other imperfections, and takes about 6-8 hours to built. Cutting and machining ALUMINIUM ANGLE by hand doesn't go as fast as one would think.
They are what they are, they will not hold a MAC truck, they are not painted a pretty color, they are not perfectly CUT in every way. However they WILL hold 1-8 GPUS and 1-2 PSU (2 psu large size, 1 psu small) Your MOBO and A HDD
For all my critics, go to Home Depot, get some ALUMINIUM angle and show me what YOU can do.
For those that want a basic rack to perform a basic function, contact me via the link above or
www.hashinghawk.us