Coincidence or not, there are two one-piece windscreen T 87s for sale. Believed to be private conversions, the first one is offered on http://inzerat.i-bazar.cz/1475682-tatra-87-r-38/ . Advertized as a 1938 model, it looks more a heavily converted 1939-1948 model with one piece windscreen, different grille and non standard bumpers.
The second one, http://inzerat.i-bazar.cz/1397952-tatra-87-diplomat/, is a 1948-1950 “Diplomat” model and also in need of a full renovation.
Comparing the one-piece windscreen jobs, the windscreen on the older model seems to fit better and with its rounded sides to be more in style with the original three-piece windscreen. The conversion of the newer model makes the T 87 Diplomat looking like never realized postwar T97 series car.
To see another one piece windscreen T87 for comparison, click on http://www.eag.unicweb.ee/m14.html and scroll down the page.