Glad to report that I was able to make my 2hour layover with ease coming out of the OZ flight in Intl. terminal, getting my luggage, walking them out onto the transfer area (turn right, then left, then left again after walking out of the luggage area will take you to the transfer area where a skycab look-alike person took my luggages). The process took all but 45 minutes from my getting off the OZ flight to my walking over to the UA gate (including getting my boarding pass printed at the UA counter and re-enter the domestic security line), did not take the terminal shuttle and walking from intl. terminal to terminal 7 (where UA is) took about 10 minutes.

Thanks for all the advises though!