This is what I've come up with for the power packs on the Trimaran ships:
Wildcat (and Hellcat eventually) with dual packs:
Close up
Head on
and the Lion with the single pack:
Head on:
According to 'R11.R5 - Power Pack' "...It was hard welded to the belly on the centre section of the CW and DW......The Wildcat BC and Hellcat BCH carried two of these power packs. The Lion DN carried only one" hence the location under the ship rather than in the position shown on the SSD. Mind you, you cant really show something as being 'underneath' other stuff easily on a 2D diagram
More to come soon
Thu11s