Yeah, people have already built loads of extremely expensive, extremely low-capacity, "high tech" transportation systems, and many of them started off as an absurdly unrealistic artist's impression before being gradually revised until they were basically a pretty standard monorail or cable car or busway or something.

If he perseveres with this long enough, I'm sure he'll eventually build something. It will probably end up just being a subway with weird angles and metallic paint everywhere.