Well,like I said, it's just a static display. It's an actual production plane thats been gutted. So its really just the fuselage and paint scheme. Besides, you can't see into this one's cockpit as its about three-four meters above the ground and theres no ladder or platform to look from, and the windows are smoked/painted black.
This is the one I'm talking about:
http://www.ab2m.net/pics/sr71/17979/As to the cockpit, have you seen these? :
http://www.sr-71.org/photogallery/blackbird/simulator/I think its the best you'll find.
About weapons... well, the only ( Officially claimed ) capability I know of is the YF-12A which could carry the AIM-47A AAM.
"SR" are the designators for Strike/Reconnaissance, ( This was a mistake made during a public statement by Nixon referring to the plane known at that time as RS-71, but was not corrected of course, as he was the Commander In Chief. It has since been known publicly as SR-71 - true story. ) but its only publicly confirmed mission was photo recon. The most recent version is the SR-71C and is still fairly secretice in capability and equipment. The mission is still strategic photographic reconnaissance. Since the Air Force publically aknowledged the Blackbird the strike designator was used because the plane's ability for strike was in it's speed, range, and low-observability- not it's payload- as far as I know.
However, it has been speculated by some whom I trust, that the space used by the REMOVABLE camera pallets were of sufficient volume to allow for at least two B61 nuclear weapons, or two AGM-69 SRAM. I don't know for sure, because I've never seen what the interior of the empty camera bays look like, but I have seen the B61/AGM-69 nuclear weapons, and this sounds about right. It would be a useful platform in the event a cold war suddenly heated up, in my opinion.