see my post on the subject,

http://3dprintboard.com/showthread.php?10815-swapping-to-glass-bed


i have totally removed the alu bed, and placed the glass directly ontop of the heated mat, using the corner clips from here

http://www.thingiverse.com/thing:278540

and now i have a removable glass bed, need to get some more glass cut, then hot swappable beds