Mac I had gathered from your intro that he was'nt a newbie, I was impressed by how much he had got done so soon after starting a new project!
That arch could be used as a monument or palace entrance in some fictional east european dictatorship.Fictional countries were a pulp staple,.The model has a fascist look to it,have to remove the rubble piles unless your scenario takes place after or during a revolution.You could have the dictator employing mad scientists to build robots to compensate lack of manpower and waning political support. OOPS! Sorry letting my Imagination run away there. I'm sure you'll find a pulp scenario for it.It is a stunning model