I placed mine at the top of the firewall behind the engine. The engine is inverted, so most of the heat is low. Heat does however rise. Either way, I have had no issues with it mounted there. The CRRC 40 should tug the model around admirably! I have upgraded all my CRRC ignitions to CH ingnitions. The drag about placing the ignition inside the fuse, is you would need a hole through large enough to get the plug cap through. That's a bit large. I suppose you could have a screw on cover to fill all but the wire hole once through and screw this on.

The other build thread is great and quite active. It is nice to keep as much info as possible in one location... IMHO.