It always seemed a little intimidating to me, and turns out, it is. A less experienced builder would probably have a lot of trouble with it. Instructions are not always very clear on where to place parts.
The blade assembly. Very fiddly! I Drilled out the holes for the attachement of the blade to the arms and made some pins, since the kitpins where way to short.
Wiring always works great for bringing a model to life, although I haven't got a clue af where they are supposed to go. I'm pretty technical, just not with engines. But hey, as long as it looks good...