@Ahuman: I have already replaced the entire set of ships twice ;) ... so it's really a question of what you (we) want. If one reimagines an old fav - like the USS Enterprise - one must needs respect the loved styling.
Bear in mind that the images are mock-ups - composite screenshots off Wings3D.
However - I definately hear you. Particularly about the effects. So far I've just been tacking them on.
From the above reactions...
- Python gets a definate "yes". There are now skins for all the python roles... oxp coming. The plan is to have the neo replace the existing model, and a new ship-name and lowered probabilities assigned to the classic. "Classic Python" or "Restored Python"?
- Anaconda is "OK"
- Boa - mixed reaction - it's a good model, but is it a Boa? It also doesn't modify to a cruiser class too easily.
Here's what happens if I keep more of the original shaping:

(fig4. Alternate Boa)
If you put it alongside the classic boa you can see the upper-hull styling matches closely. The classic extends further below though and has a really fat rear. Don't worry too much about the geodesic effect on the underside - thats a separate model, which can be smoothed in the game.
- PCC - I already have a shark-styling on the Typhoon Class Cruiser ;) It originally had big teeth too (scanned from aircraft decals). Personally I don't like the PCC model - and I'm still thinking of how to do a consistent "cruiser class" for each of the larger ships. The standard cruisers are boxier, bigger, faster.
This leads to the main issue, for me, in attempting a "cononical" level upgrade - changing the classic ships is easy... it's all those OXP modifications.
That's why I suggested perhaps the classic ships can be kept as "Classics", which makes the oxp varients into "customized classics" like you get for cars.
BTW: would there be interest in me providing the models themselves rather than just pics? This also allows other modellers to try the ideas out, see what a tweek will do.