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Excellent question Tom.

If they were all original Boston Whaler parts, then:
That is called the "Full Monty". :-)

Actually it would most likely be a Sakonnet 16 with the optional stern seat.
Optional interior options were basically, RPS, Stern Seat, Bow Platform.
Those options basically determined the model.

All of us know the standard configurations below as described by Boston Whaler:
1. Nauset = wood console, wood bench pilot seat
2. Eastport = wood console, wood bench pilot seat, wood stern seat
3. Sakonnet = wood console, wood reversible pilot seat, wood bow platform

Here are some other possible Gray areas.
wood console, optional RPS = Nauset with optional RPS
wood console, wood stern seat, optional RPS = Eastport with optional RPS
As you mention above = Sakonnet with optional stern seat

Here is one that can be confusing if you just look at the boat.
What model is this? http://www.whalercentral.com/images/S...et_rps.jpg
wood console, RPS, no bow platform = ?
Some people automatically think it is a Sakonnet.
Some, like myself, think it is a Nauset with the optional RPS like I mentioned above.
With this one, you would need to look further to see if this hull has screw holes where the platform was removed.
It can't really be 2 models at once. Can it?
1. Nauset with the optional RPS
2. Sakonnet with the bow platform removed
Both of the above boats would look identical.
However, if it never had a front platform, then it most likely is #1.

So we need to go back and look at what the standard configuration is according to Boston Whaler.
Boston Whaler can only tell us what the model was when it left the factory.
Boston Whaler cannot tell us what the model is now which could be entirely different, as mentioned and shown above, in the "Custom" configurations.

In my mind, I go by Boston Whalers standard configuration when looking at a boat.
It is what it is now.
#1 Nauset, #2 Eastport, #3 Sakonnet
And those models should have the standard configuration with the possible options as mentioned above.