Junkyard Corps mod for Half-Life 2

Two teams of players face off in opposite junkyards with one aim: to obliterate the enemy's yard. They have a variety of raw materials at their disposal. These can be used as crude weapons, as with anything in the yard, or, they can be made into something more effective. Technology can also be stolen from the enemy, and raw materials can be stolen if a team is short.

Extensive and lengthy technology tree!
Two teams, The Eagles and The Bulldogs!
Two fully functional bases that can been upgraded and added to!
Anything can be picked up and used as a weapon!
Weapons include

Spanner
Crossbow
Plank of wood
Nail Gun
Shard of glass
Nail bomb
And much more!

The Teams

The Eagles
Playing for the country of America is The Eagles. This team on average has better materials available to them but their upgrades require more materials than the British side. The Eagles have fewer upgrades than The Bulldogs but on average their base made weapons do more damage.

The Bulldogs
Playing for the country of The United Kingdom is The Bulldogs. This team has a varied yet low amount of materials available to them at the start of rounds so it is imperative they "acquire" materials in other fashions. The Bulldogs have a vast amount of upgrades compared with The Eagles and they cost considerably less materials to make. The Bulldogs weapons generally do less damage than The Eagles but they have access to more.

The Rules

The Base
Players are split into two teams, each of which has their own base. Base access is restricted, so players can only enter their own base (at least to begin with), as the doors will only open for friendly players. To stop enemies entering bases when a friendly player goes through the door, automatic door turrets will be placed near them, like in TFC. The walls of each base, however, are fully destructible, and once destroyed, the door turrets will also become inactive.

The Junkyard
Between the two bases will be the 'junkyard', a desolate area filled with, well, junk. This junk will be split into three types (probably): metal, wood and glass. Players can collect junk from the junk yard, but only one piece can be carried at a time, and whilst a player is holding a piece of junk, it will be their only available weapon, and will have a fairly weak melee attack only.

The Objective
In each base is a junk recycling machine. Players that are holding a piece of junk can deposit their junk into the machine, and it will then be added to the team's store of junk. When this store of junk reaches a certain amount, the team's tech level for that particular material will be raised. This will upgrade the available weapon for the junk class to a more powerful model. Once all three material levels have raised past a level, the team's base walls and defenses will be automatically upgraded. This means that if all three material classes are upgraded evenly, a team will have a strong defense, but if a team concentrates on only one type, they will obtain more powerful weapons faster, and will thus have a strong offence.

The End
The game ends when one team manages to destroy the walls of the other team, infiltrate their base, and destroy their junk recycler.