More ideas=
-Plasma Heater= Add extra damage to plasma weaponry due to heated plasma
-Speed Cycler= Increase Minigun firing speed :gun:
-Plasma Concentrator= Reduce spread in the Multiplas rifle,increasing accuracy. (if it has spread :mellow: )
-Scope + Stock (for SMGs)= Reduce recoil,and allows zoom.
-Grenade Belt Box= Increase ammunition capacity of the Grenade Machine Gun
-Power Catapult= Reduces the Fat Man's arc,thus increasing it's range. :nuke:
-Iron Plating (Already present in Fallout 2)= Although technically it's cheating,but this mod will obviously increase the Boxing Glove's damage (It's hidden under the layer of the glove) :slap:
Cons=
-Plasma Heater= Heated plasma could make the range shorter.
-Speed Cycler= The already ammo-greedy Minigun will be more ammo-greedy :facepalm:
-Plasma Concentrator= This will reduce the Multiplas rifle's spread,thus making it less effective for attacking clustered enemies than the non upgraded version.
-Scope+Stock= Increase SMG's weight
-Grenade Belt Box= Ughhhhh

...... It became heavier...
-Power Catapult= Reduced arc means it will became less effective against entrenched target (Although the mini nuke's explosion is capable of killing entrenched enemies easily :dead: :nuke:
-Iron Plating= Hey! You're cheating! That's not good! :slap: