You need a retaining wall. But first I think you should consult with a landscape architect or designer to get a plan going for what your landscape should look like. Then you can execute the plan yourselves or hire it done. Carolyn Albert-Kincl, ASID

Thanks for your comments everyone. We've taken your advice (Luke and NH) and changed the island to a rectangle (1200 x 3000). We lose one breakfast bar seat but gain storage and dining room space plus it shortens the distances from the island to the cooktops. It also removes the need for a corner carousel. We're much happier with this result. Dairy_maid, we've done what you suggested and walked through some common tasks. Overall it works reasonably well although we may keep some coffee spoons and butter knives in the scullery drawers for morning toast and coffee. We've also invested in a "silent" rangehood which has the motor on the outside of the house behind the fridge and we've upgraded the scullery sink to one that is 600 x 400 (internal size). Fabrication starts tomorrow. Woohoo. Once again, thanks so much for taking the time to respond. The design has been significantly improved with your input.

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Here is a layout indicating some minimum dimensions for usability. I would recommend you go larger especially if two people are often going to be using the space at one time. This also does not account for window space or furniture or storage.