I am not impressed.
Anyone - and I mean lit'rally anyone - who frequents this board could have done that. The idea of having a single HP pool for a vehicle of any size? It's an obvious solution to the "sections" problem of previous editions, because the first reaction someone would have to "how do we solve this?" would be "get rid of them."
A solution that would have received praise - from me - would have been one that acknowledged that vehicles and creatures are different, while retaining the streamlined-ness of the rest of the edition. "But that's hard." Yeah, well, tough crap.
I am disturbed by how wow'd people are by this solution. Is it simple and easy to run, sure, but you didn't need a book to tell you to do it this way; it is elegant simply by lack of attempting to push the envelope, which - I'd argue - isn't truly elegant. This is a solution that a DM pressed for time or pushed into an unexpected situation would come up with and, while it works, it is not robust.