Hehe, looks like a pressure cooker.
I charge my wife's eGo batts in the dining room on a big glass table with nothing around that can burn. Hopefully, I can successfully build a VV mod for her that's small enough so I can get rid of all those horrible eGos. I hate those things. They wear out in like two seconds, they fail a lot, and they explode on the charger a lot. So far, I've heard four accounts of an eGo exploding on the charger.
I don't have to worry about my own mods. They have fail safe redundancy on the protection systems. I use a full featured charger controller (Microchip MCP73833) with both cell temperature and time-out safeties. I also have a 600W TVS diode (Littelfuse SMBJ5.0A) at the USB receptacle on the mod to protect the charger controller from power surges that could be picked up by the USB wall wart. I have three over-current protection systems. There's a PTC fuse, a voltage detector, and a current sensor that can all shut down output in the event of a fault. My feeling is there's no such thing as too many safeties with a Li-Ion cell.