Fantastic! My project has just wasted one and half year, and to me, substantial funds on a proprietary autopilot solution. We just decided that enough is enough and set out to find an alternative.
I think we realized that the chance of getting a response was slim, so we are grateful to have your response.
When I say "we", I refer to myself and my partner/tech. support Mr. Bradley Nel at Industratech. I am located I Bergen Norway and he is based in Durban South Africa. I started the project five years ago purely as a one man operation on my spare time, and Bradley joined in, three years back. I have set up a webpage to keep interested parties informed. You find it here: Solairship.
Mr. Nel just received the PX4 last week and is looking into the configuration. I will invite him in now that we have made contact, and he will have questions I am sure.