Project I started some time ago and worked on every once in a while. It is not perfect and there might be a few disproportions here and there given the nature of the typical blueprints you find online. Few of the parts I had to improvise, for the top view I used reference pictures of a toy model.
I'm still learning, but I started 3d modelling around 2004. It's safe to say that I didn't put that much time into it over the years.
Here are some pictures of my workflow and some simple clayrenders.