Weapon Equiping problem

[JeveKnight]

I have an idea just like in Pimp my Peon, where I wanna make it if you research a level 1 sword, then all ur units of a type get the special effect of a sword and their damage increases, and if you research a level 2 sword, your damage goes up and a diff sword appears in your unit of type hand.
I know how to apply special effects and all, but this equip style is really bugging me. Can someone help me make this type of upgrade your unit style equipping items? thanks.

 

[Metaldrummer]

If you're asking about the upgrade, it's a simple custom upgrade based on Iron Forged Swords with 19 levels. Pimp my Peon is all about the triggers. If you want a version to look at, a while back I found a single player version of it where the enemies have a 300 food cap and 10 spawn rate. I attached it to this post if you want to go through the upgrade and trigger info.