All but the smallest of kitchens need two slabs of stone. Or, 1 1/2, of a retailer sells it like that. The average slab is 9’x5’ and yields 44 square feet of stone. Most not Houzz sized kitchens average 60 square feet of counter. A small condo kitchen can be under 30 square feet. In addition, the pattern of the stone can increase the needs for additional stone in order to match those patterns. Large dramatic patterns can cause an average 60 square foot kitchen to need 3 slabs of material for the best possible match. If you are flexible in getting the best possible seam down to “good enough“, then that can drop it back to 2 slabs. To get the maximum yield from stone, regardless, with the highest chance for successful seams, means that you need a medium to small particulate pattern. Avoid the current drama queen marble looks. They increase the need for stone, and increase the possibility that the seams won’t be as aesthetically pleasing as possible for matching flow.

I moved the gas line for an all-gas range over a few feet in a previous kitchen. That home dated from the 1950s. It actually wasn't expensive or difficult. So much depends on the construction of the home, how much distance you are moving the range, and what the rest of the kitchen is like. I'd also want to know that if the OP is moving the range, she has thought about the proper exhaust ductwork at that new location. The OP has not given us enough information to give her an informed answer.

@ Lisa - Renovating the whole bathroom - doing custom vanity with a woodworker as I cannot find one I like with all drawers and freestanding and 72 inches. Sigh! Since it will have U shaped drawers at the top, I need to provide sink measurements. Egg and Chicken story. :/ @wdccruise - Thanks, I will check HD. @live_wire_oak I would only need 12 square ft or so for a 6 ft vanity so I guess I won't make the minimum.

The standard distance is 30-36” between the top of the cooktop and the bottom of the hood. Anything higher and the cooking effluents have too much opportunity to escape the hood. Anything lower, and it’s too cramped to cook under and looks cramped too. What if you have a taller pot you want to stir and look into - how to do that comfortably if your hood is mounted too low? The 18” is referring to the distance to the bottom of the adjacent upper cabinets as Calidesign mentioned. When you said “I'd ideally like to mount all cabinets at 24””, I don’t know what you mean. Please explain. The standard distance from the countertop to the bottom of the upper cabinets is 18”. Some people may go an inch or two higher than that, no more. You wouldn’t be able to reach the shelves if the uppers are installed much higher than that 18” distance.