The only actual assembly so far has been the prop. I really don't know why can't manufacturers make single-part propellers. They can cast this kind of resin parts:
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But still the prop has plastic blades and a resin hub.
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Okay, the hub is nicely cast, detailed and all, but it's useless since it will be completely hidden under the large spinner, and complicates assembly. (a good example of improving kits MPM's Fokker D.XXI's, the 3rd series fit had a resin hub & plastic blades, the later 4th series kit has an all-plastic single-piece prop assembly)
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The spinner provided some small problems on it's own. The holes where the prop blades go through were too small and required some filing, and the hole inside for mounting the hub wasn't centered, so I just cut off the locating pin from the hub. Strangely, the instructions don't mention the backing plate that is provided, and clearly shown in reference pictures.