I stick built a Kadet LT.40. I was very proud of it. Here it is before I went to my second day of flight training at my local club.
Here it is after the second day of flight training.
Yup, I was flying my rectangular pattern around the field showing that I could maintain altitude and had a mid air collision. I was just flying along and all of the sudden, it was falling out of the sky...
My trainer said he'd never had a mid air in his 30 years of flying.