I do know this. You need set up Eclipse to not try to auto-build everything. That will really mess things up. You want to use the external ant build files (<CPAS>/modules/build.xml).

You may want to try to copy the cpas tree under your eclipse workspace directory. We have the eclipse project files (.project .classpath .externalToolBuilders/ant_build.launch) checked into our source tree. They should be more or less correct, but are not used actively.

It would be a great contribution if we had a good help topic on this subject. Any takers?