I personally think if its a "custom" weapons should be a SG or invention type construction. Of course you would need the slavage to create it. So if you wanted to make a firearm you'd need alot of metal and projectile slavage; CC weapon metal and raw material and so on. Personally I was hopping for somthing like this when bases first came into the picture but it seems temp powers only.
If I'am all wrong all together about the custom I'd love to see a dual weild pistol sword AT.