The next thing was to mount the spring. It needed a bit more framing to mount it, so things were starting to design themselves
The space under where the fridge might go, takes three Kmart sealable plastic boxes perfectly.
At this stage, the plan was to put the fridge at the back, and the fuel tank in the centre. The trouble was, that the fuel tank has to be mounted high to enable access to the filler, then the space underneath would be hard to get at.
I spent a wasted couple of hours looking at it, until Phil walked in and said "why don't you put the fridge in the middle?"
It was obvious. The weight of the fuel cell would be variable, obviously depending on the amount of fuel in it, whilst the fridge weight would be fairly constant. It made a lot more sense to put the fixed weight inside the wheel triangle. The space next to the fuel cell could be used for battery and electrics, whilst the space underneath is still for storage/tools.