Will there be a landing assistance UI without an autopilot? For example, a UI that tells or shows distance from the center of a hangar or distance from the walls, a bottom-facing camera, something.

Yeah, if you've been playing Star Citizen a long time, you'll remember the old landing UI, which displayed a little version of your ship relative to the landing pad. We absolutely want to have, maybe not that exactly come back, but something approximate to that to give you that spatial context without you having to go into external camera view.