So Cheetah seems just fine.

Here's a quick abstraction of what I've already done into a template. A few quick notes:

I've spun the CSS off into a separate file now (now that we might be dealing with >1 page)
I think you're supposed to save the file as a .tmpl - not sure but that's what I've done.
It expects the following variables:
funcname - name of function
$base_addr - of the function, not the whole rom
$file_name - of the binary
$state_machine - filename/path of SVG
lines - array of dictionaries, containing:
'address' - of the line (BTW why is this a hyperlink?)(and should we not make them all anchors?)
'data' - raw
'inst' - mnemonic
'params' - rest of instruction **with registers and numeric consts already marked up**
comment
There are three arrays at the end which *should* be dictionaries and have some more templatery, but for now the template is just them raw (you could put HTML in the vars):
references
calls
callers (for the "Called by" section

Hope that's useful

PG