It's your thing, do what ya wanna do. There was seldom any wood showing in these boats. They sometimes used a bit of mahogany in the bracing but even there, it was usually plywood. There were some great hybrid boats made with mahogany decks and "low-maintenance" glass hulls by Century and Chris Craft.
One guy showed up at several of the Shows with a faux woodgrain finish on his deck. It looked real nice but wasn't fooling anyone. There is generally, no precedent for mahogany on most of the, pardon the term "fiberglassics."
I'll leave discussion of finishes to people who know more than I do. Your finish looks really good. What I've heard from other people is:
Use gelcoat to be authentic or if you plan to use the boat a lot.
Don't use enamels if you plan to spill any gas on the boat.
Car finishes chip with frequently used boats.
If you plan to dock your boat all summer, use epoxy finish or anti-fouling hull treatments. Use approved hull treatments for salt water use.
NOTE: There's a new line of organic epoxy gelcoats in testing phase by a Florida boat manufacturer and may be available later this summer from ecopoxy. (see the link at http://www.americanclassicspeedboats.com) Spray without any special safety equipment. Leave your boat in the water. Sounds great.