Very impressive!
I have an Airfix Saturn V kit in the den at the moment, about 90% complete. It's years since I worked on it, but I have many other calls on my time, even in the den (one of my other hobbies is wargaming and I paint the armies I use).
I only have to paint the Saturn, but I don't have an airbrush, nor the inclination to get one. So it's going to be a very slow job of brush painting.
And since I started painting the kit I've changed over from using enamel to acrylic paint. So I think I might have to spray it all over with a primer and start again...