Wow, thank you for sharing; these are wonderful! Love all the art, the zoomed-out vision shots, all the extra stuff in the back ... Just the other week I had been contemplating importing the books through Amazon Japan and an importing service. Still might. Eheh.
I was hoping to find some information about the Phantomilian language in the books. In the WC Door to Phantomile guidebook, the interview at page 134 has Yoshizawa and Nakanishi talking about the language starting on the right side of the page, but a few columns of text next to the binding weren't flat and got blurred. Do you think you could rescan that page? Or if you don't want to bend it anymore, take a photo.
Was having difficulty trying to analyze the Phantomilian/Japanese versions of Stepping Wind and think this might help.