First I made the pieces I needed. None of them is exactly.
Here you can see them:
I started sanding the botom exactly. Therefore I mostly glue a piece of paper on the part that has to be sanded. Below the situation on the disk sander:
Then I glue the back of the cabin and the dashpanel to the bottom. This two pieces both are over sized:
After the glue has dried again I sand the pieces exactly according to the bottom;
Now it,s time to glue the oversized engine hood on it:
And again making it exactly on the disk sander. Below you can see the result after sanding:
No its time to glue the sides on it. Below one side oversized:
First I sanded the botom of the sides exactly flat. Also the window is already there. Below you see the sanded sides:
Now it,s time to glue the sides on the body.
-- My englisch is bad but how is your dutch?