Ok, What's a good board that won't waste space in the case?
Honestly, the motherboard you have is fine. A larger board will either A) cost more or B) Have less features (assuming same price). Either way you still wouldn't solve the issue as then most of the motherboard would be unused Is there a smaller version of that case?
Let's be honest, everything in that build is overkill for what he's doing
Well yeah, that's the point I think a lot of us have tried making, I just gave a more detailed example