Avery Boyer wrote:
How were the hull blisters mounted on the SCB-125 Essex conversion, specifically Oriskany? Was she any different from the other ships?
Here's what I have so far:

Avery, as far as l can tell hull blisters were uniform for all vessels in the SCB27 and SCB125 programs.
It appears that the SCB27A program had blisters about three or four feet wide and l think they started a little further forward, about where the fo'c'sle deck drops down to the hanger deck, the aft end looks about right.
The three SCB27C with out angled flight deck had the same SCB27A blister but it appears to have been swaged outwards locally around the port side escalator housing that was fitted in that program, escalators were fitted to SCB27C and SCB125 rebuilds but not the SCB27A rebuilds.
These three carriers are also unique in that they had the aft elevator #3 moved to the port side, ie they had the elevator fit of the later SCB125s but not the angled flight deck of that program, these elevators were also considerably further back than the other vessels and the plane handling crane and its sponson was mounted in front of the elevator, later vessels had the crane and sponson mounted aft of the elevator. Those three unique vessels were CV11, 14, 19 and differed from the rest, even when they finally received there SCB125 refit.
Last comes the full SCB125 refit which interests you, its basically the SCB27 sponson width but extra platforms canter levered around areas that encroached on that narrow deck, the escalator is one and l think there was a refueling station there too.
The blisters are welded construction so where the lap plate side sheets change to smooth is where the blister starts and ends and it is a smooth transition, not bulged like an armoured belt would be, if that makes sense ?.
Best
Michael