I'd done a previous Enterprise TOS with lighting, though this one was more complicated and I had to mix a 3V and 12V circuit, and I'm not an electronics engineer 🙁 But there are some very good tutorials on LED on the internet.
I started the bottom side of the saucer with de Aztec decals from Acreation Models but it was a disaster (see the gaps ; also very thin, and rather poor print). So finally I dropped the idea of the Aztec pattern not to ruin the whole model.
The kit decals worked out fine. But the circular ones were a real challenge. It took me ages to get a decent curved line. So far the most time consuming decaling on a kit.
Tim Heimer Nice work! There is so much more work to light one up! The 350 scale took me 5 months, so I know you went through some time on this one. Looks good!