Of course, most could be built, since they are often on pretty good sites with little environmental impact. That said, I do recall some pix in the old books of filling swamps, etc. that couldn't be done now, so it would vary.
I presume you are figruing Ross or Mac came back to life and tried to implement their exact same design on the same site? I am sure the beaurocrats would have a few changes even on the best of sites, including setbacks from creeks, adjacent roads, etc. which are all greater today than back in the day.
And the real questions would be if the ragged bunkers would look the same if they put in modern irrigation. Would the put in cart paths? Would the tees be bigger, greens flatter? Would there be ladies tees? ETC ETC ETC