Help Needed with patching a counter stove top gap

I have a smaller stove replaced and now have a large gap because the cooker hob is a little oval and the originnal was square. How should i go about patching the hole?

http://www.youtube.com/watch?v=luR2odhlN3g

I got the item on youtube for a better idea
thanks
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wrote:

Still got/can get the tiles (or whatever) ?
If not choose a contrasting material.
Build a deck within the original cutout, trimmed back to be rectangular with clean edges, replete with the new finish.
IGWS the new hob should go in the centre of the old/new opening. DG
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