In contests people use 3D Printers, Laser Cutters, CNC Machines, but not everyone has access to these machines making it hard to compete with people that do. I think we should have building contests that does not allow any use of a 3D Printer, Laser Cutter, CNC Machine (anything that is done digitally). Going back to the good old "Hard Labor". That will give people that have REAL skills (not me) a chance to win a 3D Printer, Laser Cutter, CNC, or other products as well.
Its hard to complete when someone can just digitally design something and have the machine do all the work (as easy as cutting out a perfect circle). I just would love to see more projects made by hand and not digitally done.
I know it will be hard to prove the person made it by hand and not with a CNC,Laser cutter, etc. That being said maybe you could require them to post a lot more detailed images of them creating the project. Along with everything they have used. That will help you determine if it was really made by hand.
Just use of basic shop tools. Lethe, Table Saw, Band Saw, Sander. Nothing that would do the work for you digitally. I think we had a contest like this before, but can't remember. If so would love to see it come up more often.