Not much can be found on the subject of creating eBooks in kindle/mobipocket. Much less is to be found about periodical format - i.e. the format in which Newspapers are publ
The other way is to use Calibre directly
http://calibre-ebook.com/user_manual/news.html
you can even use this to download and prepare RSS feed, then edit the html and then compile to mobipocket:
ebook-convert myrecipe.recipe output_dir
ebook-convert output_dir book.mobi
Looks like the generated ncx wont work with kindlegen