Well my idea for making it into NW was because of the cannon mechanics. Wasn't sure if that could be moved to Warband so I figured I'd mod it into NW. My main motivation to try this was to create Jan Boruta's war wagon actually useble in a game (I'd post the pic for some epic eye candy but I'm too tired to find the link).
The cannon I found (after the slightest bit of tinkering in the map maker bit) was just a bunch of separate entities; the cannon, cradle, wheels, ammo box, etc. Then there was the actual usable cannon which when placed on the map was just a white box (if I remember correctly, was awhile ago that I did that). So I thought, "what if some entities were doors that were also part of it, that lead onto a platform that was pulled by a horse like a cannon. I'D HAVE A MAKE-SHIFT WAR WAGON!" This also sparked an idea for a sea battle, but I'd leave that till after the wagon was successful
So a good way to try it out (and set fire again to one of my favourite mods) was to make a mod using it.
On a side note, I haven't done a whole lot as work and the apprenticeship have gotten in the way. I done some reading for the modding too, but not a whole lot either. Probably get some progress done in September when I head to school.