As insanely cool as this is, I think the most impressive thing you’re going to do is transport all your LEGO from its current location, outside, down the ladder, and into the bunker. Can’t wait!
That's as simple as lowering them down by rope, in a tote that's just small enough to barely fit... I wondering how how all the moisture is being dealt with, like all the snow that was tracked in, or if climbing out every time to piss wasn't considered. SomeThing that seems to not really make this a good SelfContained "bunker" is that the power may be just branched from the house, instead of SolarPanels (or WhatEver other easily renewed source) to ReChargable batteries.