The first thing you have to do is to go on down to the hardware store and then get your hands on some materials, with which to build this storage unit. You are going to need some pieces of lumber and some PVC pipes. You will also need some heavy duty nails and paint if you want to add some finishing touches to your storage unit.
Get a slab of wood and drill holes on it, these holes should be some five inches to six inches in diameter. Space these holes some two inches from each other. Now take this slab and attach it to a back panel of wood. This back panel needs to be connected to a base, since it will be holding up the whole unit.
Now take some PVC pipes, preferable ones that will fit into the holes that you created in the slabs. Now slide them in here and then screw them in the holes in the slabs. These will be acting as the holders for your rod, so you want to spray them and clean them up from the inside to prevent any friction and scratches to occur on your rods.
Once everything is in place, go ahead and test it for stability. This is going to be essential in you making a decent storage unit. After this is done, go on and paint the whole unit if you want, in order to give it a more personalized touch.