I like your lid. I'm doing something similar on my Sankey (slightly bigger British version of the M416). What gauge tubing did you use? I went with 14 gauge, and was debating on whether to go with two or three cross members. I see you went with three, I only have two and I'm putting a James Baroud on top. I'm also in the midst of installing my gas springs. My tent weighs 175# and the lid will probably be another 90lbs or so-- I'm going to use 3 pieces of AL treadplate, probably .063, and even that is going to be about 30#. With 12 ga steel, you should be able to strap a hippo to yours and not worry about it bending! :sombrero: