Python 3.8 (pre-release), 263 243 bytes
-20 bytes by applying some small modifications.
Darn, didn't get first…
def f(b): l=len(b:=[j for i in b for j in i and[i]or[0,2]]);S=[[" "]*-~l for i in range(l+1)] for i in range(l):S[i][l+~i]=S[i+1][l-i]="\\" for i in range(l-1):S[l-2-i][i]=S[l-i][i+2]=" "if b[i]else"/" return"\n".join("".join(i)for i in S) Takes input like f([1, 0, 1, 1, 0, 1, 0, 0]).