Well, I've thought of two ways to deal with the IP (short of another CC, but that's a major waste of res). One, do as in the picture, the IP's should have clear view of the hallways, and if a marine is at the RT, and the IP is under attack he can shoot it without getting too close. The other is to build a TF along the wall facing the CC, and drop IP's against it. But that's a waste of res in my opinion.
I'm not a fan of elec in base at all personally, but from playing on LM, I've learned your marines can be less than responsive, so it's good to have. I'll create another strat in the way I'd prefer...