[ukmu]

Yeah, XMostWanted559X...just about ANYTHING painted black would work fine for your style of setup. I would suggest a 2x4 for the second row and two 2x4 nailed together for the back third row. A 2x4 is actually 1.5"x3.5" because of shrinkage in the kiln drying process...so you need just 6" plus another 2" or more for the front row....that book case/shelf unit you have would easily accomodate that and would ALMOST be invisible when painted a matching black. Or something along those lines, just a little boost is all you need for your bleacher style risers.