Charcoal, 42 bytes
ＡＥθＥＳλθＷθ«Ｅθ⪫κω↖↓⮌υＤ⎚Ｆ⊟θ⊞υκ¿θＡ⮌Ｅ⮌§θ⁰⮌Ｅθ⊟μθ
Try it online! Link is to verbose version of code. Not very Charcoal-y I know; probably why it's so long.
Neil
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