Welcome aboard. With your frame and if you want to bring your armor to higher levels, go with AP. The AM will be to big for you.
I'm on my cell so, I can't really get you the link for the paint, but if you go on the main page, you will see a photo reference button on top. And same thing for the rivets.
To join the armor, go with the cover strip method. It's the accurate way of doing it. And it's not harder to do.
For the electronics, mic, speaker and Icomm are to give a better feel to your armor. Fans are almost mandatory, especially with the Aussie heat lol.
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