I agree with you re. the (absence of) book. But I like the deck very much... it's intriguing
To a first approximation, I feel it can be read as a Thoth work-alike. The Majors (and Courts) incorporate most ALL of the Thoth symbolism! For the Minors I (unashamedly) happen to
know the Thoth keywords for each card, so that's my
starting point. Thus, if I draw the Five of Wands, I begin to think what I associate with the word "strife"! But then my own meanings are some superposition of many (broadly similar) GD decks...
As a next level of complexity, you could explore the subtle
differences between the Thoth keywords and those of "Book T" (qv). Or, if you're very keen, you could explore the possibility of deriving "meaning" for the cards directly from the astrological attributes (these are marked on the cards!). Indeed,
perhaps like Mr. Crowley et al. did?
The "quantum leap" is perhaps in making sense of the minor images, without further info. Clearly you could do this intuitively (as many on AeT) or find some more standardised basis for interpreting the images. If you are of the latter pursuasion, there have been some discussions on the nature of the images on this forum.
But basically, the Minors incorporate elements of traditional/historical "
Images of the Decans". But, as noted in the LWB, the author has used
several sources, with elements from EACH (or none?) of these! Try Googling various names/terms from the LWB. And, if you are still not phased, I'm sure I/others can make further (link) suggestions...
Macavity