Gaps/overlap in part fit up

[Philippe Hurbain]

I'm just curious how other authors deal with gaps or overlap in parts when building models.

Yeah, models that rely - even a little bit - on parts flexibility or play in joints are a nightmare to model. Modern models are less prone to that, but it does happen in older ones (here I mostly speak about Technic models). When this happens, I first check what I have modeled so far (might be a mistake somewhere), and if I find nothing I try to minimize visual impact by distributing the error over many joints.