How to add a top

[jcirafic]

Hi, I had a cheapo plastic cd\dvd\vhstape holder as pictured in the first attachment and decided to weld up a replacement. The 2d and 3d attachment show the result. Unfortunately I stupidly neglected to consider that the height of the tapes go above where I ended the angle iron! http://www.millerwelds.com/resources...milies/eek.gif
Any suggestions on how to add height and a top before I spray paint this thing? Thanks..