Many thanks for the tips, advice and warnings guys - much appreciated.
In terms of keeping the top flat, I was thinking of doing the job in two halves with a generous overlap, so I would cut off the non-flat, knobbly overlap portion, leaving a flat surface, one in the bottom of the wooden case, the other half in the top. That's the theory anyhow!
I'll let you know how I get on, although it won't be for a couple of weeks as we have our astrocamp this coming weekend and I'm not game to try to rush it before then!
Cheers
Dennis
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