I got most of the details finished on the 2nd Pilot Enterprise, so now I just have to focus on weathering the ship. Since the pilot Enterprise(s) didn't have the gridlines, and I refuse to add aztecing or paneling that was otherwise not on the filming model, I have to rely on subtle weathering to give the ship a sense of scale and detail. I know there's some debate on whether (no pun intended) the pilot Enterprise was weathered like the series Enterprise was.
There's evidence that at least the saucer top of "The Cage" Enterprise is weathered, see below:
And some subtle weathering evident on the saucer top of the "WNMHGB" Enterprise:
There isn't much evidence that any other parts of the ship were weathered, but to be honest, the model looks like a toy without it. Therefore, I've decided to subtly weather the entire ship, regardless of whether (dammit another pun) or not it was, in fact, weathered in such a fashion. Rest assured, I will keep it subtle.
I didn't get further than weathering the saucer top and bottom tonight, and will continue with the rest of the ship tomorrow.
Here you can see the weathering I've added to the top. Compare the weathered saucer top to how plastic the currently un-weathered nacelles look:

And here's just the color information, so you can better see the subtleties. Also note the bluish base hull color (the model was painted a faint blue-grey for the pilots, and a grey-green for the series proper).
And again, with the bottom:
