Thanks Erik
You may find it amusing to know that I keep a file with some statistics on the models I've been assembling since 2003. That's when I searched the net on this subject for the first time and got
The total stands at 210 models and 109103 parts, not counting extras like train rivets...
In the first picture, the part 7e is printed in very thin paper. This is good because the zigzag shape would be very hard to achieve with normal paper.