These are the maps so far that I've decided to use in my outline, if they could be "game-play scrutinised" go nuts.
There are 25 chapters in total.
"Guy, Girl and a Magical Blade" Prologue.
Prologue map, left to right, minimal bother.
"Head-Hunters, Sword-Seekers" Chapter 1.
You start at the tavern in the top left, boss in the bottom right structure.
"Paying the Border" Chapter 2.
I'm thinking that you'd start the fight in the middle of the gate with enemies being to the south, you're defending the gate to earn free passage through to the south plains.
"The Trader Caravan" Chapter 3.
Top left again with you having to reach some green units that are to the right of the small middle mountain.
"With the Guise of Night" Chapter 4.
A hopefully fog of war map where you're within the fortified walls and you have to defend from enemy siege.
"The Runaway, Inbound" Chapter 5.
My planning has the players starting top left, with the enemies to the right. The bottom left is aesthetic but I suppose maybe something could be done with it.
"Pulling Strings"Chapter 6.
Your forces will be split here between the fort in the top left and the small town to the right. It'll be a defeat all enemies type of deal because your group has things they need to figure out here so they can't just leave, yadda yadda.
"Men of the Water"Chapter 7.
You start at the right and the enemy are sort of spread between the bottom of the water to the top left, narrative-wise there's a group collecting water for local tribes and they begin to run off north when they spot you, though your groups goal is to head south.
"The War Disposed"7x
My original plan for this was to have a choice in it but I've scrapped it, I'm following the suggestion from Glenn up above and making it a defend against a mostly flier unit, maybe I'll chuck in a couple ballista to compensate.
"The Forward Operating Campaigns" Chapter 8.
Most of your units will be starting on the right, your main two characters and a flyer will be at the small huts up top, fighting off hostiles that have ambushed them, you need to regroup and defeat the enemy forces. I think this map probably will end up being shrunk because of that.
"Mutually Inclusive"Chapter 12.
You'll start in the bottom right, there'll be two forces to contend with, top left with more "native class" units and right with more "military class" units, bottom left is nyeh.
"Blood Price" Chapter 21.
I haven't really thought out unit structure in this, I just wanted to nail a city aesthetic, main goal is to reach the bank in the top middle area.
"The Man of Gold" Chapter 22.
The idea here is that this is meant to be a bank, the best I can do with FE tiles, but there are four bosses on four green tiles you have to kill to open the four gates to the main boss.
"Rays of Despair" Chapter Final.
A simple 1 vs 1 map.