Eventually, I did it! It took me a lot of time, but this map is finally ready.
The Wall is a map designed for asymmetrical gametypes, so you're gonna have a lot of fun playing Assault, CTF, Territories or Stockpile on it. Moreover, the map works very well with Team Slayer and Multi Team Slayer. If you had the chance, don't forget to play Invasion! I set a specific Invasion gametype for this map (here's the link Bungie.net : Halo Reach : File Details), but you can as well play with the standard one.
Last but not least, the map is ready for every other gametype, from Infection to Race, so feel free to play whatever you want.

As you may notice from the screenshots, the map consists in a huge wall which dominates a canyon. The wall offers great protection against foes and gives a tactical advantage over the enemies in the canyon.

Anyway, the wall is not an impregnable position. The opponents have a wide choice of vehicles, and there are four ways to get to the wall:

1. From the main ramps

2. From the structure on the right of the wall (you'll se the ramps and this structure in the picture below)

3. From the structure on the left of the wall

4. From air

The weapon choice is wide, and you'll find everything you need in the battlefield. There are two sniper rifles, some DMR's and Needle Rifles, two rocket launchers (with low ammo), two concussion rifles, two granade launchers (again, with low ammo), one Needler, two Plasma Pistols, one Fuel Rod Gun, some ARs, one Focus Rifle, one shotgun, two Machine guns. Don't worry for the balance, these weapons do not alter too much the gameplay, I tested it. I did not put any spartan laser on the map, but you'll only find it in invasion (it spawns during the last phase).

There's a wide choice of vehicles too. You will find a Scorpion (which, due to the structure of the map, is really easy to take down), a Falcon (maybe the greatest threat), a Rocket Warthog (if you are dealing with the Falcon, this is your choice), a Ghost, a Revenant and Four Moongooses.

I'm sure you will enjoy this map, and please let me know what do you think of it! ;)