This may be one of those buyer beware sorta things. But this file works for making a moveable TECH starbase(Argonev) in my environment (http://dl.dropbox.com/u/5790092/Temp/StarBaseTech.entity).
I tested this with a fully upgraded starbase going through multiple attacks and building frigates during the attacks. The starbase will also auto-engage without any issues. I had docking booms and the BRB and used them both without any mini-dumps.
I've tested this in Entrenchment and Diplomacy. I've done the more thorough testing in Diplomacy, (i.e. I did not do a full upgrade path to docking booms and BRB in entrenchment).
Also, note, there aren't any required mesh points dealing with movement.
Enjoy if it works for you. If not, well... <disclaimer inserted here>