Clearing up some questions here:* Prizes will most likely be money, not K'NEX sets* Well, I see a title as a prize... that makes it 6 prizes. You can win both money and title, I'd say.* Yes, it's possible that when I build your tower, it can fall over (when it aaaalmost, but doesn't at your house)I can say I will use normal pieces, no weak or damaged pieces. But you'll have to trust me on that.* I've added a picture of what I mean by "Large Wheel" at the bottom of my post.Austron's questions:"Am I allowed to build a base and stack up 25 Big Air Ball Machine tubes one on top of each other? Because they're official pieces"* Yes, they're official pieces. They're rare, but that would give an unfair advantage over beginner builders or anyone without 5 big air ball sets (almost everyone participating) So therefore I decide that I will list which pieces can be used. That will make chances more equal for everyone.> Please give me some time to make a picture of all pieces that may be used.> TIP: Colours may be used in advantage to claim title "most beautiful!"> Extra Rule (will be added in Original Post): @GWorks (myself) is as organisator not allowed to win prizes. I'd like to participate for the titles, however.