You make only one error. You say you do not have artillery in this fanfic. You do! What else would you call what Fred & George unleash against that giant? It would work gangbusters as long as the trained people were there & the enemy didn't become aware of what was planned. The surprise alone would make for effectiveness
id think that voldemort couldn't be killed that easily. hes like a ghost living in different peoples bodys pretty much. i guess if they destroyed all the horocruxes first, and then had him so that he couldn't move or use his wand it would work, but they would never be able to get him like that
I liked the story and the use of muggle equipment.
I as a retired soldier like the idea that fred and george hate the inventions the made to win this war. War is nothing to glorify and neither is taking the live of a fellow human.
That is a very interesting theory.... and while I think it would work I don't think that JKR would use Muggle technology in her stories. One, like you said most wizards would find it beneath them and not bother with it when they find their own wands more reliable and effective. Two, the Muggle way is a bit barbaric and something about killing off Voldemort through magical means (or as I'm thinking, through means of Love and Voldemort's lack of love) is a much more noble and civilized thing for Harry to do. I really enjoyed the story though and I think it would make an awesome ironic ending if Voldemort were to meet his demise through the inventions of a race that he had deemed inferior.