[Hierakares]

This czech website could be of interest for modellers:

http://www.umt.fme.vutbr.cz/%7Eruja/modely/podklady.htm

There are lots of 3-view-plans of WW2 aircraft (and not only such). Some are in bad quality, but some are high resolution scans.

I do not know if a D.520 is among them, but it could provide initial material for other projects, too.[/url]