Thank you for the effort, Doctor. But the red dotted line is not correct. The big grey line is the correct one, and it calls for a very gently sloping roof and nearly flat underside.
The only correct way to use the template in a side view is to align the ground planes in both images, scale them so the roof has the same height as the template, then move the template left or right to align the arrow with the top of the roof as you did.
This results in a roof that's surprisingly flat near the driver's head, surprisingly high where the car's taillights currently are, and extremely long. Though you can truncate the boat tail at 50 or 70% of its full length with very good results.
A ground-plane reflection of the template is provided so you can use it in plan view as well. Line up the arrow with the widest part of the car, and build an extension that tapers inwards perhaps twice as fast as the roof could.
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