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The external hardpoints (there are actually six) are located in front of and behind the bomb bays so they won’t interfer with the doors and have support of the internal frame structure. Here is some info that I have lifted from various printed sources.

“The aircraft has a overall payload of 134,000 lbs., including air launched cruise missiles, carried in three internal weapon bays and on six external hardpoints under the fuselage. The maximum internal weapons payload is 75,000 lbs. and maximum external weapons payload is 59,000 lbs. The external hardpoints can carry the AGM-86B ALCM as well as electronic jamming modules and fuel.”

Also you might be interested in the following:

“The B-1R is a proposed replacement for the B-1B fleet.[8] Boeing's director of global strike integration, Rich Parke, was first quoted about the “B-1R” bomber in Air Force Magazine. Parke said the B-1R (R stands for “regional”) would be a Lancer with advanced radars, air-to-air missiles, and F-22 engines. Its new top speed—Mach 2.2—would be purchased at the price of a 20 percent reduction of the B-1B’s combat range. The FB-22 is an alternative proposal.
Additional enhancements would include network-centric capabilities, air-to-air engagement, active electronically-scanned array radar, improved defensive systems, and opening up existing external hard points for conventional weapons.”

This is the only photo that I have seen that shows the placement of external ordinance.

http://en.wikipedia.org/wiki/Image:Boeing_B-1R.jpg

RH