I am ready to fab the linkage that holds the canopy open. Obviously a string that will break for a jettison option is the simplest. Gas struts are cool , and would consider that if someone can suggest the layout and strut specs. However, the folding metal linkage I recall in pics seems robust, light, simple with no preload on the components. So does anybody have some solutions to share for the RV4 tip up ? Pics would be very helpful