That is interesting Mike, I will document the 2mm repair and see how it goes. As far as i could find the original was 2.5mm or close to but I forget where I read it. A bit of reinforcement is never a bad idea.
Hope all goes well with getting her in the water, try to get a video of her for us to enjoy.
Forgot to say thanks again Nick, I went with 2mm mahogany so wee shall see how it goes, currently looking at paint strippers.