golfing cube

:# https://codegolf.stackexchange.com/a/224741/92319
Cls&@Set $=@Set
%$%/Ah=%1*2,z=0
%$%F=@For /L %%a in (1 1 &%$%P=@^<nul set/p&%$%C= @If ,%%y LEQ %1
%f:a=y%!h!)Do @(%$%/Aw=%1-z
%F%!w!)Do %P%=C
%F%!z!)Do%C%(%P%=//)Else %P%=\\
%F%%1)Do%C%(%P%=^^L)Else %P%^"=C""
%C:EQ=SS%(%$%/A z+=1)Else%C:,=not %%$%/Az-=1
Echo()