RB-29 pointers

Had a 1/144 RB-29 “dumped” on me. Done a bit of research but figure 'twould be faster to ask those what knows. #1… 4 gun turret. Was this a Korea Only mod? Only upper forward position , or was it installed in other turret positions? How previlant? #2… RB cameras. Where they installed in the bomb bays? Photos I’ve seen dont seem to show windows along the belly. #3 … Did the RBs carry bombing radar? (AN-APQ -13). Did all bomber versions carry radar?