Steve,
I just remembered that Mike West of Lone Star was developing a kit featuring a turret and platform kit for Camel in 1/48 scale. It's not listed as underdevelopment now but that doesn't mean he's not still working on. You might want to contact him and see if it's still in the works,if not Mike's good at sharing information.You leave know the kit may be available shortly or he could point you in the right directions for drawing and information.
Highest Regards,
Gregory Jouette
PS: In the mean time I may have a drawing for you that I look for here. I believe it's drawing of the platform carried aboard the USS Texas around 1919. When I find it I'll send it your way.