I mean if we're being real smart, you'll realise that it's impossible to get a 1920x800 resolution in both WSE2 and Native (I tried both, doesn't actually work it forces 4:3 or 16:9), what HiReaper done was he took at 1920 x 1080p screenshot with 90FOV and cut the bottom half, which is why it's in the same position with the cloud location etc.
Base native also doesn't allow for multiple monitor mode, so you wouldn't be able to get a stretched resolution like you can in WSE2 (which can only happen if you have multiple monitors, which in itself makes for harder gameplay as you'll have to be looking much more).
Edit: Might be another way of getting it to that resolution, dunno