I have them all but
Sandstorm and got hooked after reading
Map of Bones.
It then took a few months but I just read
Black Order last month. I have the third book in the series
Judas Strain up next. Spacing them out cause his last book, Alter of Eden, wasn't Sigma but then I found out he is planning a 7th book in the series tenatively titled
The Devil Colony.
The two I've read were very intricate. Especially Map of Bones, I don't know if even a 2.5hr movie would suffice. They'd have to cut some sections out for sure.
Thanks for posting this and its a project I'm going to follow!