I am afraid that after opening it up there is no way you can fill anything in the hull. I have to remove the smoker just to put in electronics, and the battery compartment is actually at the front of the tank by lifting the front glacis plate. There is no way I can put anything flammable near the lipo battery.
On the cosmetic side, the kit that Carson send me actually has the casing for the flame thrower rather than the MG, except that that piece is not in the original spurs, but is coloured the same way. Somehow Carson got it made to match the trailer for the Crocodile. Very nice indeed.