The engine intakes.
The intakes took a fair amount of work to assemble. Again, the parts didn't really fit well.
Here's the result of the "tweezer massage" that I applied on the intakes. Looks pretty good. But it took me an hour or so to massage that intake to shape.
Attached! Notice that the part doesn't line up very well. I had to remove and trim off some of the extra cardboard from the intake.