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Maybe this price list for a Bare Hull in 1977 will help.

Bare Hull came standard with:
Bow Eye
Bow Norman Pin
Drain Plug
Heavy Duty Rub Rail Kit
Mahogany Bow Locker Cover
Ski Eye
Stainless Steel Side Rails

That's it... Nothing more, Nothing less.....

At he bottom of the photo below, Note this:
"The bare hull 17' offers customization of interiors."
If you take a bare hull and add an interior, according to Boston Whaler, you are customizing it. It is no longer a bare hull if you added seats, console, or something similar. It becomes a customized or Custom model.

The same goes for other models.
A Montauk includes certain factory items and so listed in the price list and configuration. If those items are no longer in the boat, then who knows what model it is or was? Thus it has been customized or now a Custom model.