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!