Can't answer specifically and information hard to dig up. However, I have had some experience with electrically driven winches.
Just a thought or two. My educated guess would be a centrally located steam driven or hand operated winch. The various boat could recovered using a rope / pulley configuration to accommodate.
Onboard DDE/DDH (RCN) a electrically driven winch was used to recover the Ship's Boats. Winch was centrally located for use on both Port and Stbd sides of the ship. If the winch was unavailable, the muscle power of about 40 people would be used to raise the boat by rope and hand.
May not be what you are looking but should help in thinking though the problem.
By the way I am impressed with your choice of ship to build and will follow with interest.