Assembly Ships of the Mighty Eighth by Jacek Jackiewicz and Robert Bock only lists 6 B-17 assembly ships. No real insight gained in the book about why 24s instead of 17s.
"What is interesting is that assembly ships were used mostly in the Liberator bombing groups, but rarely by Flying Fortress units. The most significant users of such aircraft were the 303rd, 370th and 384th BG. However the group commanders found that this assembly process had little advantage over group leaders firing flares, and they disliked the idea of using precious fuel over the British Isles."
B-17E 41-9043 381st BG "Little Rock-ette"
B-17E 41-9020 303rd BG "Tugboat Annie"
B-17F 42-29947 303rg BG "Wabash Cannonball"
B-17E 41-9100 379 BG "Birmingham Blitzkreig"
B-17F 42-3441 384 BG "The Spotted Cow"
B-17G 42-39914 351st BG "The Black Bitch"
"Birmingham Blitzkreig":

"The Spotted Cow":

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ellice_island_kid wrote:
I am only in my 20s but someday I will fly it at airshows. I am getting rich really fast writing software and so I can afford to do really stupid things like put all my money into warbirds.