I built this closet system based on the plans here. So easy and so basic, just putting them all together to make a very nice looking closet setup. I used 12 sheets of birch plywood, and premium select 1x2 pine. All stained in Minwax Jacobean and satin clear througout with semi-gloss clear on the drawer fronts.
For the rods, I used chainlink top bars, which cost $6 for a 10' piece, and used #0000 steel wool to buff them out and then polished them. For the 45 degree corners, I used 1" electrical conduit, and placed two 45 degree bend in each piece, and again steel wool and polished them as well.
For the drawers, I used soft-close slides. When using these, I highly recommend installing the rear brackets as well, as they make installation so much easier. 16 pairs of soft-close drawer slides with brackets cost $120 for all of them on Amazon.