I think this plane should have been added long ago, as it adds another country's plane.  

Likewise, Romanian/Hungarian country's would like the IAR80 81A-C rolled into 1 variant in the hanger.
So make the next plane update have the Boomerang, D520 and the IAR.  Add 3 country's at once 
Nice TB a Bulgarian D520 of 6 Orliak at Karlovo   
 
 The 520 like the 109 went both ways,