Just for laughs (and if anyone cares), I decided to check to see if the S500 would fit in my garage BEFORE I wasted too much time thinking about it. Comparisons to my SLC:
S500 vs. SLC

L: 199.4" vs. 196.4
W: 75.3" vs. 70.5
H: 57.3" vs. 52.4
Wheelbase: 115.9" vs. 111

I am SHOCKED that the length is so close, although the 5mph bumpers on the SLC add a lot of useless length.

So it will fit. Now all I've got to do is find an S500.
Or a CL500.
Or a 400E.
Or a 500E.
Or a CE.
Or a C36.
Or a 450SLC 5.0.

I hate decisions.