I'm enjoying your Unacompanied Django book. I have the easier version of Nuages down pretty much how I want it, and have started on your three Gypsy Etudes, which I'm enjoying. I've just been watching a video of Angelo DeBarre playing solo to open a concert, and some of the lines and chords were very similar to your Étude #1, which is great - it means your studies are based on real-gypsy-world situations, and I am beginning to really get into DeBarre's playing.
So, do you have more Etudes? Some things along the same lines? If not, are there books by others you would recommend for getting deeper into this style?