Unless you put a cover on the back and title it a coupé instead with a very large boot... supposedly.
Anyway, the above isn't about legalities it's about potential and I reckon this has it. Smaller wheels, shorter suspension, estate shape, properly finished bodywork and a splash of paint, it could be awesome.
The white pick up is super clean, and I love what he's done with the front bumper and valance. I'm looking at the picture and seeing so many little details that, as has been pointed out, it seems odd he didn't put a straight edge on the bonnet. Clearly, fabrication of a small detail isn't an issue with the rest of the build.