If you're just playing through the game, this won't matter to you.
But if this entry scores the required 21 points to be implemented into the
L'Arrangement contest, then this file will be very important for the sake of
smoothening out the process of switching engines. Several details are not
obvious in the context of a single chapter, so these will be explained.

All testing was done on normal mode. I bear no responsibility if hard mode is
impossible to complete.
The opening FMV is very crusty, since it has to fit into a GBA. LT should use
the source file I used to create the video instead: I can convert that on request.
I'm willing to replace the opening FEU logo with a dedicated L'Arrangement logo
if one ends up being created.
If you can't insert the FMV, shame! Judgement will be passed.

All midis edited for FE8 can be replaced with their original equivalents.
Do whatever is easier.
Though official art requantisations could be replaced, it would be easier to
just import the portraits as they are.

The cutscene map is entirely decorative, and there is no need to worry about
making tile changes work.
The scrap tiles are internally dragon veins, calling an event that gives the
player a random item. They clear themselves once used.
The item list can be found in EngineHacks\ExternalHacks\TrapRework\Modules\DragonVeins.
Sigurd can dismount, and must dismount to access indoor tiles. Per contest
rules, this doesn't apply to other mounted classes.
It never comes up in this chapter, but Enteh has the monster weapon flag set.
TRS spoilers, somewhat oversimplified: she's a dragon. 
Some characters have predefined supports with other characters. These are just
for decorative and plot purposes. I say, as if this will have a plot.
When selecting Mario, a voice clip of him saying "Let's a go" plays. It will
play once per map, the first time you select him.

The Mallet is Mario's rapier. His death is a game over. He is the lord, at
least until the midgame party wipe happens.
Owing to midgame party wipe, I doubt he'll get a plot promotion.
It is not reasonable to acquire the Tyrfing in the armoury. If you somehow
get it, Sigurd can use it, along with any other Major Baldo people.
If you can get your hands on a knight crest before everyone dies, it'll work.
If you can give Hornet a knight crest, she becomes a halberdier!
Unless nobody else implemented halberdiers. Then she will be sad.
The Hover Boots grant Acrobat.
The Rope Dart grants Lunge.
Holding the Gold Bar reduces move by 3 and speed by 10.
The Flashbang inflicts sleep on hit.
Only Marth (or Chrom, or Lucina) can use the Falchion. Oh, he's not here?

Various engine tweaks inherited from the hack I branched this off:
There is no mitigation of weapon weight whatsoever.
Only 3 AS is required to double an enemy.
The file select UI is entirely recycled. I assume a unique one is planned.

The ending choice here just changes the final line of dialogue, but it really
should have some sort of consequence somewhere down the road. If any future
chapter relies on a choice for some reason, this one will work nicely.
Choosing between Slippy Toad and Yumemi Okazaki should change something in
twenty chapters. Somehow. Even if you don't see them.
The final congratulations from me should be deleted, as it is written in the
context of it being a single chapter contest entry.

The project buildfile can be found at:
https://github.com/Darrman/WarOfLovers/tree/arrangement
If anything's unclear, yell at me and I'll clear it up.