Jade only supported ubuntu, kinetic only supports debian intel and arm64 - raspberry is arm7 (32bit). Building it from source is extremely painful on a raspberry, it's certainly not a viable or sensible answer to this proposal nor are third party or commercial offerings. The ubuntu-pi-flavour offers a stripped down headless ubuntu 16.04 which is an excellent start, although it's torrent only and still needs quite a bit of installing and setting up.
I'm really surprised at the response to this proposal. It's a really great idea - the new ardupilot organisation has some money from donations/memberships etc and wants to push things forward with bounties. $500 is not a lot of money - 1/2-1 days work for a consultant and there's a fair bit to do. This isn't just typing a few commands and uploading a dd somewhere for the lulz, it's producing a reliable, tested, reproducible solution, documentation and videos - a solution that could introduce countless thousands of potential developers to the power of ardupilot and an onboard/companion computer. At the moment there is pretty much zero collaborative work around onboard/companion computers with this project and it really needs a kickstart. The easiest way to do this is to provide an image that people can download, flash and immediately get going with no further knowledge needed. Nothing I've heard here so far comes remotely close to that. But I bet if this bounty went live, there would be several solutions presented within days. Documented solutions that would move this area of use/research/work forward that will otherwise take months or years. My 2c, anyway.
Perhaps the developers could create a 'wishlist' of projects like this that the community could tackle, and if they want to prioritise them they could attach a bounty to speed things along.