@Dave, this is actually looking not that bad... !
you'll need to make a part for the list.tpls too.
as for comments, this will be a little bit harder then for pages and lists.
in functions.php (around line 1000) you'll find "comments.loop" as Hook. this is the one you'll need to replace the standart output.
you just use the following tag: 'COMMENTS_ROW_TEXT' => $com_text,
this should do the trick..
Added 39 seconds later:
and yes, check for deprecated stuff please!!! in PHP as well as cotonti!!