I was questioned recently about an element of the design, most noticeable in the forward elevation. I'm referring to the small somewhat triangular shaped elements on the lower part of the nacelle caps. My idea when I first drew these was to go for something of an evolutionary design step between the nacelle designs of TOS and those of the TMP era. At the time I hadn't decided whether to detail those elements in something of a grille fashion (like the nacelles of the TMP refit E) or depict them as a familiar amber like glow of the TOS E nacelles. For now I'm envisioning them glowing primarily because I want to see what it looks like besides how I imagine it. I can always change it later if it doesn't work as I envisioned it.
Since this was supposed to initially be a live-action version of a TAS design and one the TOS production could conceivably have built (assuming the budgetary resources) as an alternative shuttlecraft I leaned strongly on the familiar Class F design as a starting point. From there, though, I did want to push the design a little further ahead. The nacelles are a good example. I could have just used a design very similar to that already seen on the familiar shuttlecraft, but I just didn't think it suited the overall concept I had in mind. Still, I did try for something that looks like it could have been fabricated on a full size mockup with relative ease.
Additionally I'd like to add that I think this works better than the second Class F3 alternate design I'd come up with, primarily because it doesn't look quite so derivative.