Plan envisions a 34km tunnel from the West Bank to Gaza? That would make it one of the longest tunnels in the world (only 6 are longer) and tunnels of that length take many years to build. Don't see how Israel has resources or commitment to do that really; maybe a covered road
There are also some 60-100km of access roads for Israeli "enclave communities" in West Bank. That is also a major operation to build or maintain, depending on what resources go into them. Is it like the 443 basically a road with concrete and fences along it and pillboxes?
Also envisions improving around a dozen bridge/checkpoints that go from one Palestinian area to another, or sorts of border crossings. Some of these were already improved upon in last 20 years.
Side note: The "Gaza island" idea has been scrapped in favor of a dedicated Palestinian port access area in Ashdod. That's very smart. Can do that. Should do that anyway.
Here is the map that @realDonaldTrump tweeted. Ummm...hello there are a bunch of bubbles near Sinai that envisions a Palestinian state built on unused desert land down in the Negev outside clusters of Israeli communities. Yeah, no one in the Negev will accept that. Not happening 
Another look at the map: #DealOfTheCentury
