The first production B-36A was 44-92004 and was tested to destruction at WP in Dayton.
XB-36 42-13570 wound up as a fire trainer at Carswell.
YB-36 42-13571 got converted to an RB-36E and was scrapped at the USAF Museum in 1971 Wound up in pieces at Walter Soplata's back yard.
The only B36 that I was aware of in Fort Worth (outside of an AF installation) was the last one produced and was a J model 52-2827. It was moved several years ago to the PIMA museum in AZ where it was fully restored, not without considerable controversy I might add. This is the one that you are talking about, Cholla.
The last three 36s are at the AF Museum in Dayton, the SAC museum outside of Omaha, and the only RB left in existence is at Castle. This one holds a special place in my heart as it came from my dad's unit, 28th Bomb Wing (Heavy), Ellsworth AFB, 718th. It went from Ellsworth to Chanute to Castle. Both the AF and SAC museums have their 36's under cover. The one at Castle looks like
as it's kept outside. It's also missing it's ECM gear.