I've got SP3: Brigade Command just a week ago and I must say - it's very impressive! It's quite dynamic like all other games in SP series, and still depicts large-scale combat with great realism (from my point of view). Of course, it's date of production takes a toll: lots of OOB errors (nothing fatal, though), it lacks some modern units and features from newer SP titles.
I've tried to upgrade SP3 as much as possible and searched almost all releated sites for updated OOBs, scens and camps, graphical files, patches, whatever. I didn't find much, except for
http://www.rkka.org/download.htm, where a lot of interesting files
were hosted. Yes, that the main problem - they were hosted, but now they are all deleted from the server. And I thought, maybe someone somehow still have any of the listed files? Especially SP Camo project files seem promising as the default graphics for units in SP3 look horrondous in comparison to standards of SPMBT.