The rubber half-moon dash trim on CMCs and IMs, while not "correct" looks better than the original option, at least to my eye. Here's why:
Almost nobody uses the aluminum pieces in James pictures - they're compound bent (there's a return bend on the edge of a curved piece, which if you know anything about metal is extremely hard to pull off). Even with the pieces (and the cars in the pictures Leadpedal put up almost certainly have them), I've never seen a "correct" padded dash-trim that didn't wander along the edge to some extent.
The edge of the half-moon trim is sharp and defined, the edge of the correct trim is almost never uniformly stretched over the padding, etc., and the line ends up drifting a bit in relation to the rest of the dash. It's the only place an original car looks homemade (in the worst sense of the word).
Leadpedal's pictures are by far the best examples of original dash-trim I've ever seen, and if you look at any of them long enough you can see what I'm saying - I've never seen that trim in any replica (no matter who built it) where it wasn't worse than the pictures. John Steele tried to pull it off on my 2002 JPS and it looked so bad that I asked him to remove it. The half-moon trim is much more easily trimmed and looks more nicely finished, even if it isn't correct.
Your mileage may vary.