Build Challenge Idea

In case anyone is not feeling this, i have never made a Challenge before, if you have any suggestions to help make it better I would be grateful, I had just wanted to think if another way to include others ( hence the no CC or mods) and I am going to try to create one of each option here, maybe I stated it wrong bc you can always post another too, if the ideas aren't what you like any feedback is appreciated, thank you ?