I have discovered that many of the configuration parameters like wing angle of incidence and engine down thrust for the Avistar are listed under tech notes on Tower Hobbies' web site. I was able to tweek the dimensions of the wing in RealFlight to get the square inches listed at TowerHobbies to match the value displayed on the simulator's Misc. tab for editing the airplane. I still have some work to do on the weight but I'd like to think I can get the wing loading values to match also. I'm using 2 degrees for the dihedral. I'm pretty happy with the accuracy of the simulation with the possible exception of the throttle. I have to cut the throttle to about 1/4 for the simulation to behave similarly to the way my plane behaves at about 1/2 throttle. I've tried messing with the ATV values on the radio but with only some success.

Some of the other settings: fuel capacity, overall length, CG of wing.