Flipped the lid today and filled in the gaps on the other side. Managed to add an extra cm to the width from being unable to push the bricks together enough. Hopefully all the joins will be ok.
Flipped it back over after a few hours and a bit of heat gun to start cutting. Got 3/4 of the way round with a jigsaw until the blade was very blunt. Have to go and buy another 2 at least to get the cut finished. Hardest part is going to be getting the circles to line up on each side.
Dust masks all round.
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