This is a great guide, I've picked up a few things from this. However I have to disagree with your assessment of the defense computer. It is not useless, but in fact vital to base defense. While 19dmg/zap on top of the reactor may seem low, it is a huge boost from the 2dmg/zap with out it. In fact, the reactor boosted by a defense computer can kill a full hp mara before it can kill the RC. This is extremely useful in case your RC covering turret goes down. Furthermore, the regen (4hp/sec) is actually quite useful to a lone builder trying to keep the base alive. The less time a player has to use to repair, the more time he can be helping team with with a gun. Finally, in public games, I find that teams are not always as communicative as I'd like. Big white letters telling everyone on the team that the base needs help can save games more than you think. I recommend one defense computer in every base, within range of the reactor, of course.
