Interesting comments, Jack.. We were on a (rare) tiller version, French built and purchased new in Guadaloupe. The twin aft cabins are twins exc some ventilation is available through the lazarette for the port cabin. Without the wheel the centerline bulkhead between the two aft cabins is in fact on center.
The US built 36.7 has the aft bulkhead off-center creating a larger double and a single aft cabin. The French built ones had the center bulkhead.