I have been meaning to post this awile. This DIY video shoes how you could make a sump as well as drilling glass. These are amazing videos!
http://www.youtube.com/watch?v=CxnugJGiT3o ( part 1)
http://www.youtube.com/watch?v=pgNe_OYgoL8 ( part 2)
http://www.youtube.com/watch?v=CxnugJGiT3o ( part 1)
http://www.youtube.com/watch?v=pgNe_OYgoL8 ( part 2)