>>I assumed those davits were the post-1912 davits that Britannic also appears to have. <<
The problem is that the Olympic was never at any point in her career fitted with those huge gantry davits. He A deck promanade was never enclosed either although this model presents it that way. It's an interesting set, and better made then some that are out there, but it looks to me like that used mostly common dies and moulds with little regard for historical accuracy.