I've noticed influences from Eliphas Levi in this deck, especially his Magical Ritual of the Sanctum Regnum
. For example the Azoth symbol above the head of the Hierophant is from this work. The small inner wheel symbol on the Wheel of Fortune also seems inspired from an image in the same work; Waite obviously borrowed his Wheel from this image. I haven't found the text particularly valuable but there might be something there. W. Wynn Wescott has made notes for each of the Trumps to supplement Levi's. You could also refer to Levi's Transcendental Magic
and The History of Magic
; they're both available at Internet Archive.
Dowson seems to have been inspired by both the GD and Crowley. That might account for some minors having hands and others not. Just my 2 cents.