Jim regarding breakage from fore/aft stress as Steve W points out, with after tension straps and the tension from the fwd attachment, again I don't think you'll have a problem. this is just being held with mashing tape very sturdy.
In my case, the addition of the after canvas meant no straps were required, with lashing hooks fixed around the combing and bungee cord passed through the hem my dodger can be erected/ folded in seconds.
My requirements were full sit up headroom ( I"m only 5'6'' ) to dress, potty privacy, even boil water when raining ect.
The sail will pass across no problem, although I haven't tried to sail with it up yet (Texas is mostly dry )