Star Trek: USS Excalibur Update IV

Worked a little on the impulse engines. At first, I thought about using one of Andrew Probert's discarded impulse engine designs from the refit from TMP, but as I was working I decided just to take what was done for TMP and dial it back a little so it looks like it's on its way to being the system we see in TMP but not quite there yet. I also tinkered with the warp engine grills, halved the number so they show up and aren't just an interference pattern in the renderings.