Many “Blueprints” you find on the internet isn’t really Blueprints - they are illustrations that actually has some perspective to them. So for frontal views the roof often appear smaller than they would really be had the drawing been true orthogonal projections.
From the screenshot it looks like the drawing is what you get when you buy plastic model kits - and these are nice for referencing major features, but they are notoriously inaccurate in my experience.
Often the blueprints server only as guides - and you need to make qualified estimations based on all the views you have, and a good set of reference photos. Some times data sheets for the vehicle can help you dial in the dimensions.
For reference - this is a project where I have the same issue as you describe:
But I line them up as best as I can - using data from the vehicles’s data sheet to dial in the major dimensions. Then I keep a collection of photos which I use as reference. When I have the chance I even go an photograph my own photos to ensure I get close up of details I need. Often photos on the internet doesn’t include every angle needed because it’s doesn’t produce a nice looking photo.