Sorry i didn't get the notification and didn't see it, but these are cool ideas ngl

Not a problem - I hear that some people who are not me have these things called "Lives" and can't always respond to comments on games.

Nor Have I had too many more brilliant ideas.

Copper and Steel Wire with some other parts yields a coil gun (like the shadowstalker, but a bit less powerful to make up that you can craft it). Ammunition is made from batteries and steel bars.

Tin wire and steel cans soldered together to create a makeshift supressor that lasts a bit longer than ten shots.

Energy bank made of multiple lithium batteries and copper wire (act like a generator or power items like the vulture rather than normal batteries?)

hmm should there be like salvaging chainsaw or jackhammer by drill to get electric motor?

Idea dump: Rain barrel bottler that 'grows' outside and makes bottled water.
Black hole box that accelerates crop growth (idk if that's possible) with time dilation.
Uncommon build-able vehicles like jets and boats instead of just a car.
Futuristic free plates and barbed wire for reinforcing cars.
Stickybomb launcher from tf2.
plasma grenades.