I tested the spartian in P3D V3.4, here are the things i noticed.
1) bit of a pet peve of mine, in P3D the primary descriptor in the aircraft selector is the title= line from the aircraft.cfg. I know in FSX its never shown to the pilot so it does not have to be readable. So to find the aircraft I had to look for 'Executive VC'.
I think it would be nice if you changed the lines that read
title = Executive VC
to:
title = Spartan 7W Executive VC
2) In the VC if you hover over the throttle lever it shows as a tool tip, 'Engine 4 Trottle Control'. The prop lever shows 'Propeller 1 Control' which is what you would expect.
3) In the VC if you click the 'Display/Hide Fuel Panel' button and it does not do anything. The GPS and Radio buttons do hide/show the way you expect.
4) Flys pretty nice, don't know how she should perform so I will just describe what happened when I tried to do some aerobatics. She barrol rolled easily, twice I tried to do a loop and it went ok until I got the nose pointed at the ground and then I could not get her to come up past about 80 degrees down, before the flight ended.
5) VNE seams a little low. Twice while doing high speed passes over the airport I got aircraft overstressed. I would probably increase max_indicated_speed to 240, just to give it a buffer before the flight ends prematurely. Its currently at 225. Wikipedia, the source of all knowledge states max speed is 223kn.
Overall I like it alot, and the only thing that will push her out of the hanger, is your next version.