IMHO, your hallway would not be suitable for recording vocals... I think you'd get better results by hanging a duvet in one corner of your main room and then place a mic in an SE Reflexion filter (or similar) on front so that your back is to the duvet. The hallway area would probably just give you a horribly boxy sound with problematic room-mode resonances.
For mixing, probably about your only option is to either make some rockwool filled panels (or get some GIK panels from Frank) to stand temporarily on either side and behind your speakers to mitigate the unbalanced stereo field reflections from the window to the left and the full room space to the right.
There's probably not much else you can realistically do with this space on a restricted budget and still retain it's use as a living room.
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