I get what you are saying, but the math doesn't work out. I can think of many things that can better use the energy needed to get any of these rods into orbit. Look up the energy needed to get a satellite into orbit. The energy return is minuscule compared to the energy needed to boost it to space. If there was no other use for the energy (lol) then these might be a good use, but when the energy for such a system can be used instead for actual progress - even making much larger conventional bombs - then the inefficiency should declare the project DOA.