Love it! If you are interested in doing texture scaling the same way as the original game did, I decoded how that algorithm worked last year! It looks like you mostly use captures from 25th Anniversary, but I can also point you to how to extract the original sprites!
Viewing post in Super Star Trek 1978 meets 25th Anniversary comments
http://st25sprites.neocities.org has all the details for the graphics I extracted (including things like depth maps for the bridge if you wanted someone to be able to walk around!). There are a few things I know that I'm too lazy to upload at this time (color palette data perhaps most interesting to you) but I can if you'd find it helpful. Each subsection contains a zip file of the extracted data, so you can download every sprite used etc.