Here are a few images of a N scale boom boat I've been working on and pretty much finished this last week. I'll put the print files up soon.
It is .....

... loosely modeled after one that the Hull-Oakes mill has used (shown above.

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This boat isn't very big as shown by the measurements above.

The steering wheel is about a scale 16 inches in diameter. The two parts of the post cleat at the stern that project out from it are a scale 3 inches in diameter (.020”/.5 mm) and printed and didn't break off. There is some detail on surfaces shown that is down to 1 N scale inch (.006”/.15 mm) that prints but I don't think would print up in free air like the parts of the post cleat.

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I have about 4 small additions/changes I want to make and then I'll post the print files up on
my thingiverse.com account and the links to there here when I do.
There are more images and info about the boat on my build thread on the site
( HERE ).
A link to this whole build
( HERE ).
Sumner