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How bad is the existing slab? if you use bearers on the slab you have they should even out any rough surface. It's not my area of expertise but I poured a slab last year with my neighbour and we used wooden battens at the sides then poured the slab up to the edge of the batten. I think there's a minimum depth for concrete to stop it from cracking up.
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I've just built a garden office type building (it's timber construction though, not brick). I opted for setting it on concrete piers rather than a slab - plenty of airflow underneath it and no need to worry about drainage as the joists are all at least 4 inches of the ground. I did have to remove an existing concrete base - nearly re-used until i gave it a whack with an iron bar and found it was only an inch thick :-/
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Airhead
AlexD
@Polygon
Anyone care to advise on my shed situation? Basically need to know if I need to build a foundation wall, or can re-pour the slab and fix straight on to that (wooden structure)
Also, fake grass, what's needed in terms of layers below when laying on top of a concrete slab?