sbright33:
I am considering to make a similar demonstration using the same 2 sensors.
Please do! I haven't got a quad yet but want to make my own and write all the code for it myself. So I've done a lot of research and wrote a simulator to test some ideas.
Since you only want an accuracy of 10ft or so, you may not need to do complex sensor fusion. But I'm thinking you'll need the accelerometer to limit the vertical speed, in the cases where the baro gives incorrect readings. I've got to buy a baro sensor so I can play.
BTW what are planning to do with the fixed wing? I was thinking of making an autonomous glider which would detect and stay in thermals. But alas it's already been done: