Grumpy_Mike:
I would say that there is over six months of work here.
I don't know if it's that much ... maybe a month of snipping/soldering and another of programming.
What major problems do you see in the electronics? I don't really see any apart from switching 15A of power on/off quickly (Separate 5V PSU with lots of capacitors on the output? Thick wires for all GND connections?)