Re: [Question] A few questions
First, you need to consider if Focus is the right limitation for the armor. If it's an Accessable focus, it can be taken away with a grab maneuver. If it's inaccessable, then it can be taken away in 12 seconds.
However, as for rebuilding/relpacing it goes, I look at it like the Iron Man comics. More often than not, when a suit gets trashed or stolen, it seems like Tony's always got a new prototype or old (slightly weaker) version to use once he gets back to his lab. If he's got EP available, he's got the prototype (though it may still have a few bugs in the new systems); otherwise he's just got the version from before his last upgrade (significant EP expenditure).
Well, the limitation of OiHID is that if he's not in Hero ID, then the powers can't be used. If the villain can force him out of HID, then too bad for him. If the special effect is that of a suit, then it's going to be more trouble to remove than a focus, but still somehow removeable (even if he needs a super can-opener to do it).
Personally, I prefer the OiHID limitation to Focus for powered armor characters. This is mainly because of the 12-second rule (not to mention the breaking foci rules).
Deric