Looks feasible to me, just a different way of putting off-the-shelf pieces together. Out here in “flyover country” this would be a practical solution, no lack of open and reasonably flat spots. Not every transportation solution has to meet every possible requirement or geography.
Agreed, although I have no doubt that there will be no shortage of people who think that it's "their right" to try a takeoff or landing from a busy Manhattan street or a congested expressway. If it's possible for a stupid person to do something in a breathtakingly improper and obviously dangerous manner it's usually safe to assume that it will eventually happen.