It's a Skoda 120 or Rapide, it used all the front suspension, steering, pedals, all the gauges, rear suspension, engine, gearbox, seats just about all of it but the body.
Only mistake I think they made was that they mounted the radiator behind the seats & tried to duct the air into it. They used the standard fan, but it wasn't up to the job with the limited airflow. I got my hands on a 2nd Skoda fan & mounted them side by side, this seemed to cope but once up to temperature the fan was virtually on constantly, had I kept it I would have moved it up front like the one the OP has.