Oh Rossi didn't say 500 thousand connections? Sorry, I take it back. That was my previous version of the calculations
Yeah, you had Rossi making one million connections rather than ten thousand. Also, your calculation gave the cube eight sides rather than six. And it seems you made the assumption that each filament going radially into the reactor core's plasma had only one connection, at the surface of the 100cm^3 reaction chamber. Other than that, your calculations seemed fine!