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Nice on Dutch. You've obviously done this before.
Yes to F62 mesh, turned down into a 250 x250 deep trench at the edges Visqueen or similar dampproof poly sheeting over the roadbase will stop rising damp. Put the mesh on bar chairs to hold it off the dampcourse.
This would make a platform that won't vibrate or slide around on top of the substrate. The pier plug should be isolated from the floor, but not necessarily from the substrate. Isolation can be something like a strip of foam and left there after it is all set - have a look at CJs (construction joints) in your area's footpaths.
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