Space and Design are Important : You need around 3 feet of walking space around the island unit, and you must be sure that the drawers and doors in the cabinets have room to open. If you keep to the 36 inches then you should be OK. The only dimension that must be stated is that of the counter height. Ideally it should be the same as the rest of your kitchen units. If not, then it is not a disaster, but can be disconcerting when you are working on the various surfaces at varying heights.
Budget : Setting a budget out front can be beneficial if you have budget constraints. Having a budget to work on, you can easily adjust the types of material to be used or length of wooden planks to be purchased accordingly before ordering the materials.
A kitchen island is not a new concept, since they were known back in the medieval days when knights were bold. They are assuming increasing popularity in today's kitchens, particularly in larger homes where the kitchen is more than just a small cooking area compressed into an area somewhere between the dining room and the garden shed!
If you are looking to do a complete kitchen remodeling for yourself, or for maximum resale value, don't neglect the kitchen island. Once just a place to pull up some stools so the kids could eat before running to the bus, the island and it's function in the kitchen has changed quite a bit in the last 10 years.
traditional white kitchen with dark island
traditional kitchen island lighting ideas
traditional kitchen island lighting