Hey, I finally finished the Titan II! It's kinda late because of schoolwork and some mistakes made. The worst part was probably the lower engine section, because that needed a lot of small parts, and therefore took a long time.
Each stage is detachable, including the Gemini spacecraft itself. The stand isn't too good at holding it up, I'll probably reinforce it with wire or just make another temporary cardboard stand.
Also, I just printed out the pages for my next model... The STS-133 Discovery mission! This will take a WHILE to build.