Some buildings have restricted elevators, or require badge/keycard access to certain floors. I suspect the 33rd floor didn't, or someone called the elevator to that floor while he was in it.
Yes, this is what IP routing does. Your router needs to know where to send that traffic, and the tunnel gateway (your server) needs to accept and route it over the tunnel.
Don't forget that packet responses also need to reach your device.
Who is going to invade the US? Canada? Mexico? Running a cross-ocean invasion is an enormous undertaking. Russia is already committed to Ukraine, and mostly focused on their European border anyway, there's no way they'd shift everything east to invade across the Pacific. China could, except for all the US presence in Japan, Korea, the Philippines... Even if the US pulls out of those countries entirely, China would have more to gain by invading them, not the US.
What are you going to do against a tank? Or a jet? Or just artillery fire? And “hit and run” tactics don’t work when there are cameras on every street corner and it is a trivial problem to track people back to their suburbs.
I agree with everything except this. Those cameras are getting smashed day one. Jets and artillery are very unlikely to happen in our scenario here. APCs and AFVs? Oh absolutely, and we don't even need to have the military for that, even your podunk PD has armored vehicles now. But they're not as durable as a tank. Wheeled ones are more susceptible to mobility kills. Building dragon's teeth and porcupines isn't hard. And there are plenty of IED and urban warfare guides available, even from the US military...
I know, having had one, that you can set a power budget... but it's going to clock your CPUs all the way down and still run at least 120W with horrible performance.
Yeah there's not much getting around that. I'd just skip that feature if you're sitting close to it, or have small, high-contrast items on screen.