Python 3.8 (pre-release), 208 bytes
def f(n):
s=""
for r in range(n*2+1):
for c in range(n*4+1):
s+=" ║═╔║║╗╦═╚═╠╝╩╣╬"[int("".join("1"if b else"0"for b in(r%2,c%4,r,c,r-n*2,c-n*4)),2)%21]
s+="\n"
print(s)
Ted
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