Great multiline stuff.
Could be improved by using the actual U+2212 minus sign −, not - (U+002D HYPHEN-MINUS) when getting super pedantic.
Did something like this last week making extensive use of unicode block 1D400 and different space widths. http://math.typeit.org/ helped as well.
⎛if ⎛> (+ a b)⎞ ⎛case x ⎞ ⎛cond ⎞⎞
⎜ ⎝ (- c d)⎠ ⎜ (1 'foo)⎟ ⎜ ((> y 2) 'quux) ⎟⎟
⎜ ⎜ (2 'bar)⎟ ⎝ (t 'error)⎠⎟
⎝ ⎝ (3 'baz)⎠ ⎠
...(hmmm. For some reason that looks better in my editor than on the webpage. Apparently a fixed width font isn't necessarily fixed when it comes to unicode).