I've never done a cube but I derimmed a few 20g longs....
Damn nice setup Vic. I know for sure yours was riskier than mine is since mine is a solid piece of glass with one on the back. That definitely takes some gonads. Kudos. I've been talking to Chad and Krishna and I'm taking the plunge, if it goes south then lesson learned. I'll snap some pics of the progresshttp://www.chicagoreefs.com/forums/showthread.php?18607-20g-long-Feb-2014-reboot
My rimless 20g. It goes well with my 75 rimless but I don't recommend derimming a 75!