It's bound to happen. And it happened. I am setting the Ferrari 643 project aside. I thought I was making good progress on the kit but then found out interference problem when I tried to test fit all the pieces. Then I found out why... The instruction was so bad that unless you read with a magnifying glass, you would not have noticed that there are some extra bending of the photo-etched parts required. Not feel like fixing them at the moment, so I am putting the kit aside.