I updated the photo descriptions to give more details about the stuff I used to scratchbuild the parts.
For the top sheet, I used 0.007" sheet styrene (not lead foil... which would have been better, or even thinner PE sheet which I did not have). It's a little overscale, but I don't mind.
I used tweezers to warp & tweak the edges, just like the real thing (which got pretty battered).
I'm puzzled about the airtanks, though... there are no fittings at either end, so I am wondering if the pictures show what real in-use tanks actually looked like. If anyone has clear pics of airtank rack (like mine) with fittings/hoses on the tanks, please let me know.