Just a heads up that the KDE4-OpenSolaris group has now got KDE SC 4.4.0 beta 1 (version number 4.3.80) building the following components: base, pim, games and graphics. For me that's what makes a minimal desktop. Getting Akonadi up and running was the biggest challenge, because it needed a fix down in Qt related to bit-twiddling, compiler flags related to aliasing, and mutexes. One line, but it took quite some time to hunt down and rebuild.
You can get the sources for the specfiles here, and build from source. It will take a while. If you've built Qt 4.6.0 previously from the repo, do remember to remove it first because of this mutex change (we still don't have a good means of getting pkgtool to decide when to upgrade). Background information for this effort may be found on KDE Techbase.