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I've done both of those jobs.

Actually the distance is TWICE the length you quoted. Line loss is the distance out and back to the battery

SO

14 GA is undersized

12 GA is OK

It all comes down to line loss % (west had a good chart in the electrical area) but it really comes down to MONEY right ;-)

I used triple flat but wanted triple round but could not find it, and then used duplex for the steaming light

If you measure really good you can connect the duplex to the triplex (and VHF) and pull it all together and have it spot on the midpoint hole in the mast for the steaming light.

Anchor wire & shrink fittings = doing it only once

1.  Height of the transom rail above the static water line?

     are you talking about the stainless life rails or the deck cap ?

2.  Angle of the transom to the static water line?

     this is covered somewhere online here, i think its about 53 degrees

3.  Thickness of the transom?

     quite thick where my exhaust went thru, i'd say pushing 1.5 inches ? not sure if  this is true everywhere

Per Johns measurements and the USCG site

the DEPTH is from the TOPSIDEs deck to the base of the keel and NOT the waterline depth to the base of the keel (if you have a full keel boat vs a fin keel)

this gives you all the interior volume.

What have you owned before this ?

Is this your first boat