RE: Hatch hold down solution
That is a great Idea, I had the hatch come off my 28% LX due to the wooden tabs on the botton of the hatch breaking their glue, gave me and all watching a hell of a fright, slight damage to thr top of the wing on the way off; and I even added more glue in the build process, I have since built new tabs and epoxied and small screwed them on, I have built some small spring loaded sliding latches to make the removal of the hatch quick and easy, saves putting screws in and out all the time.
Well done!