One thing I'm going to point out from experience. When I first got my armor, I put in an FRS radio into my bucket to talk to other troopers. I wired up a special PTT button in my helmet that I could press when I wanted to talk.
Then, i put on my armor, and found out I could not bend my arms enough to be able to push the button. That, and no one else uses an FRS radio so, i ripped it out.
I use Jim's Aker and iComm and it works great. My iPod shuffle plugs into the line in on the Aker and that gives me my TK comm traffic loop. I would love to be able to use my iPhone while suited up, incase I had to talk to my wife or call someone. But for me that would mean my phone would have to be put somewhere, probably my back piece.
And then like you said I'd need bluetooth. I only have a 4 and again, no way to bend my arms enough to push a button. So how would I activate a headset to make a call or answer.
Finally... I just don't feel comfortable putting my $600 dollar phone into my armor. I put my valuables into my stanley, I lock my stanley with padlocks and then put the keys into my TD. Someone got their blaster stolen right out of their holster, I wouldn't want that happening to my phone. In the bucket would be ok but again with my 4, I don't see how I could get my bluetooth to activate without having to press a button and on top of that, with squirrel fans going inside probably would be too much air/noise to work properly.
Just my experience. I'd recommend you build your armor and make it wearable. Put it ALL on, then figure out how to do your bucket.