The Mercury 9 kit arrived yesterday. Unlike the When World's Collide rocket (8 pieces that snap together in maybe three minutes, not counting the 6 under-wing anti-meteoroid rockets) this had maybe 50 pieces and took all of 30 minutes to assemble.
Both models are a nice size, as you can see (the bottle of wine is, I measured, exactly one foot high). The When Worlds rocket is meant to launch horizontally from a ramp (in both the movie and the model) but its fins permit it to stand vertically as shown.
The When Worlds rocket went together flawlessly - just snapped with no oipen seams, etc. Mercury 9 has lots of small gaps I will have to fill before painting, but its worth it. Also if you look hard in the photos you can see a few empty slots - there are some transparent and other parts I will not install until I paint it.
Mercury 9 came with a nicely science-fiction-ish refueling and control building that is about N scale. I did not put that together.
The Mercury 9 is a fantasy design, as described on the box, by a science fiction illustrator named Scott Willis (no relation I know of) - it has a wonderful 1950s rocket-ship adventure look to it. I plan to combine these two rockets into a single three-stage rocket that is about 22 inches high - perhaps inspired by drinking the wine to encourage the inner five-year old in me to escape and help. It will go in the secret missile base (can there be any one kind?) on the other end of my layout from the town I am planning: my layout plan has a lake/duck-under hatch-cover there and I'm thinking of making it reversible: so it will lift out, flip over, and - surprise - rocket base!