The main body of the pop top has an exterior face of sheet aluminium. It is a sandwich of insulation material with a very shiny white plastic interior surface. The end caps are plastic. If you look back to #21 you will be able to see the end piece that is missing.

Colin

I've just got under the cover and opened up the van for the first time since it went away in October. It smells lovely.
Before I covered it up for winter I did a few more jobs. In addition to the extra socket near the kitchen I added a switched feed to a set of three fans on the fridge. I must admit the fridge performance seemed better than those on my Touring's, but any extra cooling help is useful.
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As I had easy access to the 12v and space was available I added a battery voltage monitor.
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Finally, before we set off in the summer I was not happy with the location of the front most cycle position on the A frame carrier as it was in line with the jockey wheel. I moved it back but had to make a couple of stainless strips to support the hinge area where the tyre racks had originally been located.
Be warned, the on-line configurator specifies a Thule Superb Carrier. It is wrong and should be the Thule Superb Short for a perfect fit. I'd contacted Eriba over this error and you can guess the reply. They do not see it as an issue.
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Colin