Hi, first of all, are you sure these are mites?
There`s no point in just replacing substrate if they are, there will still be the eggs to destroy, and if just one is left the infestation will start again, even a diluted bleach solution won`t kill those, maybe a steam-gun/machine would.(I`ve never had the problem, sorry if that`s not much help).
What species of Varanid is this, and can you show a few photos?
As far as making a Retes stack, depending on the size of the monitor, make the spacings quite tight fitting. You need to use some 1/2 to 3/4inch plywood sealed with a water based varnish for the platforms (without holes cut into the middle), then however deep the spaces between are, use that thickness of soft/hardwood as spacers, and either nail or screw together.
E.g: If this is a small animal, maybe 2 x 1 inch spacers, if larger, 3 or 4 inches, then however many layers you want (I suggest at least 3 or 4).

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