Yours has been finished differently to mine then Mine had a single piece wooden board covering the entire area in white in the above pic Where the interior of the pop top goes from white to green in the pic is where the striped canvas started with the left over loose end under the wooden board.
The fabric isn’t fitted anymore but I’ll get some close up pics of where it fits next time I’m down the farm
Pretty sure there`s no wood under there but i`ll have a check , i might be down there tomorrow - see if i can get a pic or two if it helps ...
I think that’s what I’ll have to do I don’t think there’s a way to neatly hide the pop top vinyl where it joins the roof if I carpet straight on to the fibreglass .