A house we are remodeling and trying to get it ready to rent has a drop-in electric range that measures 28 inches in width between the cabinets.

Small 4 inch hole is plenty then patch).

The slab flatness is great but I’ve got a major banana bow (1”) in the joisted section along with about an inch to makeup where it transitions.

Thus elevating the height of our side of the drive 3-4 inches creating a berm separating the drives. 

For example, a crack of 1/8 inch in a 50 year old basement wall, near where the house meets an attached garage, would almost certainly not be bad - especially if you can see that the last couple coats of paint got inside it.

In looking in the crawl space under the house one had historic termite damage and one of the original 120 year old 12 inch by 12 inch base beams was deteriorated. 

Plan on hiring someone to take out the carpets Mop: mop the floors with bleach and water and let dry for a few hours Clean: clean every square inch in the kitchen Prime the floors: get some Kilz Oil-based primer with a long-handled paint roller.

Then when trying to install outlets we discovered the drywall was attached to pine planks an 1.25 inches thick. 

what should be height of 1st shelf from Garage floor, 30 inches?

It's kind of like telling an Evangelical that "Jesus" is just the Greek name for "Joshua" and not what he was actually called -- they're just not going to believe you.I dug out around the bottom step of the stairway and poured three 60 lb. bags of concrete around the bottom step to make an eight-inch concrete perimeter around it.