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Allan, I would suggest that if you're going with timber or cement sheeting for the floor then you should build the middle section (about 1000x1000mm) completely separate from the walking floor. You can make the scope support using 4 mega anchors supporting bearers and joists, then sheet over it with 18mm compressed sheet. Build the rest of the floor so it is completely isolated from the scope pad.
At a focal length of 2700mm using any decent magnifications on a continuous floor you will get vibrations that will drive you nuts.
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