Check out this for creating a deb file:
http://talk.maemo.org/showthread.php?t=80908

hope this is what you're looking for!

by the way, change "Maemo" in your post into "Fremantle".
Because it will confuse people.

Fremantle is Maemo 5 and Harmattan is actually Maemo 6 with MeeGo compt. layer