I'm in Douluo Dalu, and I'm Gundam

Thanks for the invite. I just transmigrated, and ended up in Douluo Dalu... probably? It's not like I haven't read Douluo Dalu, and with mecha already around, this must be set sometime after Douluo II, right? But what's with these dozens, even hundreds, of countries? And why are they all named after various gods? You say it's a parallel world? Well, in that case, never mind. Luckily, the System showed up. But why is it telling me to build GN Drives and Gundams? Isn't that a little... sugoi!!!! Anyway, this is the story of a Gunpla fanatic who accidentally transmigrates to Douluo Dalu, builds Gundams, and uses force to eradicate war! (The author is a big fan of Gundam 00, so all the Gundams the protagonist builds are bona fide Gundams from the Gundam 00 series. You don't need to have seen the Gundam series to enjoy this story; the author writes on the assumption that readers haven't seen it. Since the story involves quite a few explanations of specialized terms, readers familiar with Gundam are asked to be patient. Please don't accuse the author of padding the word count, or readers unfamiliar with it might not understand. Gundams from other series won't appear in this story. For one thing, the author hasn't watched many Gundam series all the way through; for another, their settings are hard to reconcile and could lead to arguments over power levels. The System won't feature too prominently. Without it, there's no way to reasonably explain how the protagonist builds Gundams, so please bear with it.)