The absolute thinnest you could make the base-plate without any bracing is about 1.5mm, but really it depends on what you have above the base-plate (open?, channelled?, spikes? etc). Anything that gives structural bracing in both the X-Y (horizontal) dimensions could get away with 1mm thin, bracing in 1 dimension I'd say 1.5mm and no bracing (open-pool) 2mm. Thing is it'd be very hard to get a 2mm open-pool block to perform well as open pool blocks really rely on the lateral heat spread of a thicker base to widen the convective cooling area.
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