How to draw cons cell diagrams?

[Marcin Borkowski]

Hi all,

I'd like to draw ASCII-art diagrams of lists and cons cells, like the
ones found here:
(info "(elisp) Building Lists")
or here
(info "(eintr) Lists diagrammed")
or something like this.

Should I use artist-mode or is there anything in Emacs (vanilla or some
external package) to help me with that?

TIA,

-- 
Marcin Borkowski
http://mbork.pl