So first of all, the seam at the nose was fixed:
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For the rails, I more or less eyeballed the length and shape from various pictures and profiles and cut 4 of them from 1mm styrene sheet.
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With the 4 of them clamped together, I cut the notches with a file.
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I then added the various fastener holes with a pin and then CA-glued a strip of very thin styrene centred along the bottom of each one. The strip was 1.8 mm wide and so overhangs the pod a bit on each side. The overhang was then pinched with a pair of flat needle nose pliers and then bent downwards. The one clamped in the tweezers below has been bent and the others are still flat.
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Next, the areas on the underside where the rails are to be fastened were scraped to remove the paint....
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...and then the rails were glued in place.
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I actually forgot to taper the back ends of the rail fairings and so will do that once the glue is fully dry. I think these will work out nicely. Thanks for the input guys.