Hello Hamatole,
Welcome!
Using the Irex SDK is not that difficult if you have developed software on a Linux box. Porting existing software or developing something new can be a 'challenge'.

I'm not sure about the DR1000, but I suspect that the same applies.
I think you should first research if the application you plan is feasible. If it look that way you could buy one Iliad (if budget allows) and start experimenting...
About the guide: you will never get that. It is a lot of work to write such a thing, and not much fun

There are not very many people developing for the Iliad, and the people who do probably have other priorities...
Here is how I use the sdk (on a Ubuntu box)
Good luck!
PS: What kind of app would you want? I don't understand the off topic part of your message.