I built two identical acrylic racks, and I love 'em! When one starts to get dirty I pull the entire rack, move the frags to the clean rack, clean out the frag tank, and put the clean rack back in. Easy, clean, and I can control algae growth, which drove me crazy in the past.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436