RE: 300 extra special
The WH Extra 260 was done by blowing up the CAD drawings of the Extra 300 special, then we widened the fus a bit to accomodate twins. So their flght characteristucs are virtually identcal.
In full scale the 260 was turned into the 300 with addition of a more powerful engine and expansion to 2 persons, then it was made a single place plane and called a 300 "Special". So as you can see the 300 Special and the 260 are almost exactly the saqme plane.
TF