I'm cutting the tops of my battery trays, doing a mod similar to HighKalibre's tray mod, but with CF, so I can comfortably run 4s 5000's and 5s 4000's. Carbon should be here by the end of next week, hopefully have everything cut out over the weekend, unless the old lady has something else planned....
http://www.rc-monster.com/forum/showthread.php?t=21033