If you want a proper fit - You will need a vacuum forming machine and a plug/buck/mold to pull some clear sheet over.
If you can trim down the model to windscreen area - you are almost there once you print that for a plug.
The plug should include the two side windows and the inside of the roof - so you can glue it in - and the rest should pop into the window opening
I'd try to print that without the windows if you can..... Then you have the opening shape for the glass area etc...
Otherwise - You may find a clear plastic bottle that has almost the same curvature and trim it up to fit
Nice model BTW... Did you make it of find it?
Beer and painting don't mix!
