How to fit a new scarf to a Freedom Microlite caravan

I made this video at the request of a Freedom Microlite owner, as I'd replaced the scarf on our 2005 Microlite a while back. We no longer own the Microlite, so had to use whatever photos I had.
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[@mazzaniku1737]

Hi I'm trying to find out the dimensions of the actual pop roof to see if a solar panel can fit on it?