I did the math once how much range you'd get with a converted EV Land Cruiser 80. [0]
In my calculation it was around 100 miles range tops due to battery weight, aerodynamics, unoptimized drivetrain, etc.
[0] https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcS7clbT...
You may have done a calculation, but these guys have done the real thing:
https://www.jauntmotors.com/series https://www.youtube.com/@Jauntmotors/shorts
Range: 55kWh 250km (155 miles), 110kWh 450km (279 miles).