@Jian Feng Gao ye that is a good idea, well this is just one of a few ideas i had and im thinking of making a modified version and i will take that into account

I would say, if you're going to make a handle just make it as a screw in attachment to go in between the two hemispheres.

@Allen do you mean through the centre vertically or between the two components horizontally? because if you put it in vertically then it will reduce the amount of fuel that can be placed inside