I have a slightly larger tank... but it basically sits in my garage also. I did custom build a stand... so I could have the face of my tank in my family room, framed like a picture... and the rest is out in the garage. Best of both worlds... I get to see into the tank from the main part of my house, and any water mess is on the floor in the garage. Then again, since I've set up my tank like this, I have been able to plumb into my deep sink in the garage, so water changes are just turning a valve... shutting it again, pluggin in a pump, and unplugging it. Woooohooo!!! No more carrying water!!! *grinz*
Instead of drilling, you might want to consider cutting a slot out from the back for an overflow then built an external overflow onto the back of the tank. It will nicer and function much better than the typical bulkhead overflow.
similar to these (only you would be doing this from the back of the tank instead)
You can probably leave out the teeth also and just cut one solid strip out instead. Better than the teeth IMO.
http://www.reefcentral.com/forums/showthread.php?s=&threadid=534878&highlight=dremel
http://reefcentral.com/forums/showthread.php?s=&threadid=271539
Actually more like this http://reefcentral.com/forums/showthread.php?s=&threadid=444094
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