Mine had a canvas flap like you say and no bulkhead.
The PO stiffened up the gunals and companionway from underneath using epoxied wood.
The cabin was deceivingly large...more room than the Oday.
A guy and his 18 year old girl friend could slip up forward and camp their brains out !
The 2nd best part was the tall mast and 165 sq ft of sail made her lively....!
Anyhoo I want try to bag one that might be lying around collecting flowers in Ontario/Quebec.
Great boat and great memories!