It will indeed take a long time and alot of work, and possibly a crew... If of course that was possible, for now imma have to experiment with some tools and firstly create a map for the entire story.
If i was to play around the 12 chapter limit, the maps would have to be massive and extremely limiting to try and fit everything. For the 24 character limit and increasing it, imma have to play around the home castle, ending and children systems to not destroy it all. Either by somehow getting rid of Home Castles and have all the characters somehow fielded, therefore damaging the arena, item shop and pawn shop systems, or by increasing the number of possible units to be fit inside of a home castle, seeing that there are a ton of units.
Maybe i could get rid of some of the less important characters to decrease the work... But that would mean getting rid of characters, and i would not want that.
Also about children characters for the 2nd Generation (FE6), some characters would work very wierdly. Since some fathers have the children and the mother doesn't matter, i would have to make the game count some male characters as female characters (Eliwood, Hector) unless i make them have automatic pairings.
I feel like i opened up a box of problems with this concept idea, an okay idea but insanely hard to create.