It's a "Custom" or a "Phantom", since none were ever made. You can't "clone" what never was.
Very nice, in any case. Looks like the rear lid and the rear portion of the roof is off an AMC Hornet wagon, along with the rear quarter glass and perhaps the upper rear quarters. Lots of imagineering here. Very cool!
Kinda looks like something from a 73-77 chevelle wagon
https://farm3.staticflickr.com/2401/1823300642_bada129717.jpg
Make no mistake, back in 1970 I saw a 71 roadrunner wagon prototype / concept in the design studio when I was delivering toilet paper and hand towels. It was originally a baby blue 440 six pack carGood catch....its a very similar style.