Second question first. Yes, by using the same method (with appropriate adjustments) will make the NewsBox manager appear in the admin menus. However, it will *not* guarantee that the NewBox manager will actually work. (Most/Many seem to be ok though).
As to the first question, if you can make even a little sense of the code as per the link you provided, you will probably be able to figure it out for yourself. You don't even need to *understand* the code. It is more a matter of changing the parts that will be 'unique' for any given module. A good tip is to find another module (or 2) that has also already been updated. Do a comparison between them, and it'll become reasonably obvious which parts are 'constant' and which parts are 'unique'.
Cheers
Rod
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