Sorry these are not plans or drawings but they might be of interest to you.
The 1st one is of HMS Atherline in Sydney during WW2, and the 2nd is of "Bardic" taken in Auckland during 1957.
Bardic being my 1st ship. She was an escort carrier during the war and re-converted to a cargo ship later. She was launched as Escort Carrier "Willapa" for the USN and renamed by the RN as HMS "Puncher". Eventually ending up as "Bennevis" until broken up in 1973.
She was of the "open shelterdeck" type (as I expect all the C3 types to have been) which meant that you could load a car into No.1 hatch and roll it all the way through to No.5.
I always found that the easiest identification point was the huge "Bull-Ring" at the top of the stem.
They may have been the ideal hull for a "Mac" carrier, but it was the only ship I was ever seasick on!