After cleaning up the model, it was time to unwrap the wire frame.
I started the unwrapping operation using Ultimate Papercraft 3D. At first, everything went smoothly. Despite the clunky user interface, I was able to perform edge cutting and parts layout quickly. But then, disaster struck. As I was in the middle of unwrapping the engine, I got an "OUT OF MEMORY" error message dialog box. Huh? I checked my HDD light to see if it were thrashing/paging. Nope. Everything was okay. So I saved my work and restarted UPC3D. It ran fine again. Maybe just a glitch. 5 minutes later, the "OUT OF MEMORY" error came up again! WTF?
I quit and started googling. It was then that I saw a forum thread that complained about the same thing. And the thread also stated that the UPC3D devs declared this to be a limitation of UPC3D to support low poly models only. Hell! What's the use of having limitless texture sizes if I have to work with low-frikkin-poly-models!?
Disappointing! "OUT OF MEMORY" issues on a standalone application are UNFORGIVABLE! SLOPPY PROGRAMMING!
Anyway, long story short, I went back to PEPAKURA.
I'll just have to find another way to deal with the texture size limit.
Unwrap completed! I'll be working in 1:48 scale, by the way.
Next step, UV-MAPPING!