I agree my comment on 32 thaats was a little obscure in meaning. In fact I don't now understand it! ;-)
What I think I meant to say was that I was a little surprised to find the reference to 32 thaats, which is to my mind a little confusing (not least because you seem to name some thaats by Carnatic names rather than Hinsustani eg Kokilapriya, as I now find by looking a bit more through the Google books preview). Ten thaats is confusing enough for an introduction to ICM, especially when this is only a rough guide anyway, and broken as much in the breach than the observance, as eg even Raga Khamaj shows a difference from what you might expect from its thaat, similarly Desh. You also introduce ragas which will not often be met in sitar performances, if at all, eg your "Chakravaak", although I assume this may be Ahir Bhairav or thereabouts. I would have thought that if introducing westerners to ICM it would be most helpful to base all the introductory ragas on ones that could be found easily in the sitar (and other ICM) discographies, for comparison purposes and to understand the feel of the raga. I also still feel any book entitled play sitar raga should have at least a discussion and demonstration of teental, and in particular Masitkhani gat, which is ubiquitous in performance, and the inclusion of only 5 fast teental gats out of 50, the others mostly Keharva and some obscure, would not have been my choice. I understand you yourself say in the book you have omitted it because it is more difficult, but to omit slow/medium teental entirely for that reason at the same time as eg including extensive tihai examples feels a little odd to me, especially when you say you are targeting the book at good amateur pianists through to virtuosic professionals.
However, I am sure the ideas coming out of the raga material you have provided and written is by far the most useful aspect of the book, and an interesting new resource. Unfortunately I can say not much about the ragas, as I am not a pianist or sight reader (unlike my wife, who I am sure would like to test drive this!)