Maybe you could buy these and your cabinet maker could cut down one for you?
http://www.gumtree.com.au/s-ad/west-pennant-hills/other-furniture/caesar-stone-kitchen-benchtops/1007833130
Looks like there are quite a few options on Gumtree...
Ugh I don't like the first one at all - it is a very retirement home colour :)
I have used the mineral stone before in diamond gloss too and it is lovely.
Does the cabinet maker have anymore friends in the trade who might have an off cut?