I own an RV-4 that the builder did a similar restraint to (except his was a cylinder). Unfortunately the canopy was damaged by the ferry pilot due to starting the engine with the canopy open. I have a feeling that that section is under reinforced (mine was double metal) in the center. In my case the support was so solid that it collapsed the middle support bracket. I suggest that you make sure yours will not do the same thing. (I have photos if you want to see) Best wishes Mr. Moisture