"@Charles,  I could but I won't.  The PX4 original is in eagle.  Re-using the existing open source design and contributing back to it is easily worth $150.
I tried kicad.  The libraries are simply awful.  Overall it comes across as the  brainchild of…"

"@Charles,  I did do the board design myself. It's the only way to get what I want and to properly review the layout.  That's an extra $150 for the private eagle license.  If I ever want to sell these things then that will be an extra $500.
As I said…"

"@Ye, MAX21105 is more accurate than MAX21100 and cheaper. Availability was just a little too late for this project. It is cheaper since it does not have the motion merging engine that we can't use anyway. The interrupt mechanisms are simpler and I…"

"@Roberto, I forgot to say that the debug connector is too deep to be mounted when fitted in the aircraft.  Anything but through hole connections is a no go. "

"@Bill,  Not much market at all so far. I did this to make sure that I have something that fit inside the aircraft.
I don't plan to sell them since I will get into arguments with the local tax man and he will take most of my money away.  I might get…"

"@Roberto,  Not much difference apart from size.  If it doesn't fit inside the aircraft it is as much use as all the other options.

AUAV-X2 comes in at 30*45mm which is smaller than the uNode. That will fit nicely in the autopilot space I have.…"

"@Mark MAX21100 is one of the lower cost sensors.  Around $3.50 @ 1k volume.  It doesn't make any sense not to put it on.  It will make a nice backup autopilot with an extra gps somewhere on the bus system.
The 64Mbit memory is about $1.  I would put…"

"@James Pike - That is pretty much my thinking also.  Thanks for the feedback.

@ben @thomas  The FFC or sensor damping idea is nice but simply not for this project.  Any additional connectors add too much size.  I am already concerned that the power…"

"@James Pike.  Out of curiosity what would you use it for?

@Kees.  I have not decided on the configuration yet bu it is at least three.  Two for the wings and one as a failproof.  Then the autopilot of choice plugs into that system.  If all the…"

"@Mark,  debug is working after I discovered the bootloader update.  I used it to get the qgc mavlink-ftp file upload working.
It looks like I am using rev Y silicon.  How fu**ed am I?

I could do with getting some good luck on this project for a…"

"@benbojangles, I am not a company so this was funded with my pocket money.  Anything other than very simple is too high risk and too likely to need respins.  The prototype cost already runs at $1500.  MAX21100 cost is low and flexi proto pcb cost is…"

"@Bill,  I agree about not doing draw every frame.  That was the disaster that I tried first before going for openGL.
There is a style choice on how to create the graphics. SVG is nice but someone still needs to draw it.  I decided to write the…"

"@GliderUAV
All those items are possible or already in progress.  It is quite quick to add new things but it is not nicely organised yet.  Configuration files is one thing I need to figure out. Ideally the HUD module has no hard configuration coding…"

"@Alain,
Since the RPi is running linux it can run mavproy and mavproxy modules.  This is much more powerful than the ardustation.  You would need a keyboard but that makes it easier to use.  raspiHUD should sit on top of mavproxy ok.  raspiHUD still…"

"That should work with raspiHUD.  The fonts may need to be larger but they are all scalable.   It might be a more readable alternative to minimOSD at that resolution."