I think I read about it on the Traxxas website, but someone mentioned using clay flower pots. I've been giving that some thought and here's my idea;

Take one clay pot and set a slightly smaller one inside so the rim holds it off the bottom, giving you a little air space for insulation. Use a clay pot tray under and as a cap on the smaller pot. Dremel a hole to allow the wires to go through, use a permenant pig tail and seal it in with something fireproof, grout maybe. $10 and HD or Lowes and technically it should be fire proof. Basically the same idea as the "Bunker", just a homemade version.

The only thing I'm not sure about is if the pots will fall apart in a lipo flame out. I know we use to cook over a big one when I was a teen at this one camp spot we had and it held to gether for a LOT of camp fires over a several of years. Last time I was there it was still sitting in the same spot, but that was in the late 80's.

Anyway, sorry...I ramble at times. I guess the only way to know for sure would be to fame out a lipo in it to see. The other issue may be the temp of the lipo without some sort of ventilation. You guys might be able to answer that for me.