One hole for a drain!
....I it were my tank I would have him punch an extra hole to do a "Herbie" style drain...you will be glad you did.... the return can be anywhere you want it... back wall, side wall, through the overflow box....up as high as possible
Oh.....and have fun with the new tank
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694