Sadhu is your best find yet. He was a Martinist and wrote good books. The meditation lessons far surpass PF Case. I say that as a BOTA member for years. Case goes off 19th century OGD which places Fool at 0 and Aleph. They attribute the path connecting KTR and ChMH which I wont comment on. If you want to follow OGD read gareth knights qabbalistic symbollism. if you prefer the earlier Continental system stay with Sadhu. I prefer Sadhu butthose are really good places to start your path.
Remember
the tree of life is internal to every human being, as a subtle body it has dynamics that work with the paths