I'm pretty sure he's using the Ranger frame, suspension, and the Vulcan V6 drivetrain. That would explain why the front wheels are pushed forward and from the interior pic, the use of the stock speedometer.
If I was converting a Capri to RWD, I'd use the early 90's Ranger frame due to the nearly identical track width to the Capri and would have shorted the frame and driveshaft to make the wheelbase match.