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You have the basics right Sejanus, but build the box to the required size and place a straight piece of wood across it each way diagonally to check the level. Make sure the box can't move when you pour the concrete by putting pegs around the outside with the tops below the level of the box . When its poured use the long piece of wood to scrape the excess concrete off down level with the top of the wooden box. Should give you a pretty level base for the scope.
Cheers
Bill
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