As a personal learning project I've dug into Quake 3's SDK sourcecode and tried to make my first mod. The result is Weapons of Fury: Reloaded an independent reincarnation of the Weapons of Fury mod.
With Weapons of Fury: Reloaded (or WoF:R for short) all weapons are removed from the map and players spawn with the Rocket Launcher. When a player scores a frag, he's awarded the next weapon (the Plasmagun) and loses the Rocket Launcher. Then when a frag is made with the PG, the player progresses on to the Shotgun. Then to the Lightninggun, then the Railgun, then the Grenade Launcher, then the Machinegun and finally, the BFG.
Scoring a frag with the BFG will award you 10 points instead of 1, so getting that BFG really allows you to boost your score tremendously. There is a catch, however. If you are fragged yourself, you will be respawned with the Rocket Launcher and you have to fight your way to that BFG all over again. All weapons have unlimited ammo as well.