thats about right for the 25mm box erw, i ordered 4 lengths of the 19mm box but still have one left ,
not sure on the round tube as i used a Triton rear tub so didn,t need the tube.
as for ali sheets, depends if you are making your own side panels,bonnet & rear tub? but for the floor & cockpit panels i ordered 2 x 8ftx4ft sheets.
cheers
andy