sounds cool idea (croc mouth) and is simpler than the idea i was thinking of doing - mind you over engineering is possibly the worst thing to do as it will be mostly roof off anyway

a bit like a baby's buggy rain cover is what i have at the moment and seems to work well - just messing and adjusting to see if i can get a nice shape to it

looking good though - cheers for the tip on the slide hinges - will save me a lot of hassle doing similar