Good work. Comprehensive. Not too easy, best to be studied with a teacher only. Tryes to prepare for orchestral role. I think it is worth to do it together with a collection of studies.
It is the double bass method that I am using that my teacher swears by. It is by Lajos Montag published by Editio Musica Budapest. I am only on volume one but so far I have really enjoyed it. It does seem to be for preperation for orchestral role. Hope this helps.
I think, that the Montag method fits more to older students,who already heard about body awarness. I had to begin with this method and it was really hard, and had a lot of pain in my left hand. Also, Montag pays more attiention to left hand than to the right............
Montag is Simandl on steroids. Much more musical.
Hungarian folk songs and compositions with piano
accompaniment. Books IV and V are thumb position.
IIIa, IIIb and IIIc are orch/solo prep. I and II
encompass Simandl I material. Not as modern
as Streicher or Rabbath in approach. I get them
from Boosey & Hawkes in the UK.
Montag Method? Any opinions? 
