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I am adding more info to this thread on a Sakonnet 16 model in case others here still are having problems determining what they have.

First and Foremost, the interior of a Boston Whaler hull in those days determined which model it was when it left the factory.
If it left the factory as a Bare Hull, then that's exactly what it was. No model, just a Bare Hull.
You could customize it anyway you wanted.

You can't really compare a Whaler to cars because cars generally have a body change for models, not interiors like Whalers.
A Ford is a Ford, A Chevy is a Chevy, and a Whaler is a Whaler. That is a brand.
So, for Whalers, if the interior is changed, so is the model according to Boston Whaler catalogs as shown above and many other places here and in the Boston Whaler catalogs.
Again, the interior tells us what model it is and most of us can tell just by looking at it, what model it is now.

If you start removing parts of the original interior, as described by Boston Whaler, then you are customizing the interior and the model.
If you add a factory style stern seat to a Nauset, then it would become an Eastport as shown in a link above.
If you remove most all interior parts and add aftermarket parts, then it would become a Custom model as shown in a link above.

This all comes directly from the Boston Whaler catalogs. Not this site.
If I look at any Whaler and can't tell what model it is, then it comes under the "Custom" model name.
There is nothing wrong with a Custom model and Boston Whaler even mentions customizing models in the link I already gave above.
Many people Customize their Whaler to suit their needs. Look at all the Custom models in our personal page section.

What model is this?
http://www.whalercentral.com/infusion...r_id=15487
Doesn't matter what it left the factory as or what model it was. What model is it now?
It is a very nice Custom model that this member made to suit his needs.
There are many other members that do the same thing using aftermarket parts to suit their needs.
I don't think there is one Whaler part left inside that boat that I can see. Doesn't really matter though, does it? As it is a Custom model.

Below is Boston Whalers description of a Sakonnet 16 which includes all Bare Hull equipment plus:
(see attachment from the BW catalog)