Well done, Doug!
I'm also researching the creation of an app. I'll be working with Dept. of Conservation and hopefully NZ Plant Conservation Network on mine. I would love to learn more about writing apps, but don't realistically have the time. So, I've been researching who I could work with to pull my idea together.
I was thinking that there might be a student that would want to work on this sort of project for a class... but perhaps you might be interested yourself? You could definitely get credit toward your DTLT, if you are interested.
Cheers, Beth