I'm working on the manual and a build thread, it will be up soon.
The recovery is attached to a coupler, then held in place with rivets or screws or glued. I put coupler in, push it past where the rivet holes are, put in the rivets, then pull coupler up to them. Did not drill through the coupler. I did not use a bulkplate or baffle in this one since it is DD. Wanted to be able to friction and bang out the motor.
Just an upscaled version of the 29mm retention. Check out that manual to see for now.