To stick the segments to the base, started off with an uncovered camping mat piece and stuck down the bottom edge. Then glued the tip of the pvc to the tip of the camping mat segment and then glued the segment down.
Then the allowance on the pvc was glued down, pressing it up against the edges and curves of the camping mat segment.
Then left the next segment of the base hat clear and did the same routine with the next segment.
This meant that there's a space clear for gluing one of the pre-covered segments
in. This also means that the cardboard base hat doesn't show through the gaps between the segments of camping mat.